1,621 Invited to Share PRP “Core” Data

From the Editors: The PRP Community Database currently tracks 1,622 PRP patients who are now members of the PRP Facebook and/or RareConnect Communities, or are unaligned but have a valid email address. The 2017 PRP Worldwide Census begins today with a simple goal: confirm the data we have and add data we are missing.


If you are a PRP patient or caregiver, you have something we need.

 We can’t force you to give it to us.
 We don’t have the funds to buy it from you.
 And we would never try to steal it from you.

All we can do is ask you to share and hope you say “Yes”.

Sharing data: Are you a skeptic?

Most PRP patients/caregivers appreciate the importance of sharing data to help PRP researchers better understand pityriasis rubra pilaris. Because your information is personal and private, it is important that we safeguard any data you share. We hope that our data collection methodology encourages your enthusiastic participation in the upcoming PRP Worldwide Census.

Confidential Data — While the PRP Alliance is not required to comply with federal regulations regarding the security of protected health information (HIPAA Security Rule), the PRP Community Database is in full compliance. The data we collect about your PRP journey and the data for other PRP patients (active and in remission) is both encrypted and password protected. Moreover, the data cannot be accessed via the Internet.

De-identified Data — When shared with PRP researchers or published on the PRP Survival Guide website, your data is de-identified. Simply stated, the PRP Community Database reports numbers, not names. When your PRP-related data is published or shared, that data is disassociated with your name. There is complete and total anonymity.

The Value of Data in the Aggregate — Our PRP-related data has the greatest value when combined with the data of others.  It is the aggregation of data that will ultimately enlighten PRP researchers.

Sharing of Data — The PRP community will be notified when information contained in the PRP Community Database is shared with PRP researchers, e.g., Thomas Jefferson University, Yale University School of Medicine, etc. Such notification will include the reason why the de-identified data is being shared.

Still skeptical?

What is “Core” data?

The following datapoints represents core data. With this information we can build a profile of the worldwide PRP community.

 Elapsed time between onset and diagnosis
 Elapsed time between onset and remission
 Onset age by decade of life
 Biopsies as a diagnostic tool
 Survey PRP patients in remission
 Survey PRP children based n onset age

Name: Bill McCue
Even though we ask for the FIRST NAME and LAST NAME, we NEVER publish NAMES. WE ONLY report NUMBERS, e.g., How many “this” and how many “that”.

Location: Plano, TX
We are NOT looking for street addresses or ZIP Codes/Postal Codes)

Email: papa.bill@mac.com
The email address is the only way we can verify that the information we receive is from a valid source. We will send a confirming email to the email address of the person completing the PRP Census. If the email confirmation is undeliverable, the data will not be added to the database.

Onset Age: 66 years, 2 months
At what age did your PRP symptoms first appear?

Onset Date: August 8, 2012
What was the approximate date when your PRP symptoms first appeared? Because few people know the exact date Onset Date, only month and year is required, Do the best you can, e.g.,  August 8, 2012; August 2012, or even the “Summer of 2012”.

Misdiagnosis: seborrheic dermatitis
What misdiagnoses preceded your “official” PRP diagnosis? We are only concerned with the misdiagnoses of your dermatologist, not your GP. Options include psoriasis, eczema, seborrheic dermatitis, allergic reaction and other (specify)

Biopsy History: 3 biopsies inconclusive. 4th biopsy supported PRP
What role did biopsies play in your diagnosis of PRP?

Diagnosis Date: November 28, 2012
The Diagnosis Date should be as accurate as possible, e.g., November 28, 2012, November, 2012; end of November, 2012. Do the best you can.

Current Status: In remission since April 4, 2012 
Don’t worry about definitions. Given the choice between “Active” and “In Remission”, what is your current status? If “in remission”, what is your date of remission

Treatment Options (oral/injection): acitretin
All we want to know are the PRP-related drugs you were prescribed from the list retinoids, immunosuppressants and biologicals. Whether or not the drugs were successful will be the subject of a future survey. We are NOT collecting data on itch and pain relief, topical ointments, creams and lotions, sleep aids, etc. 

We are a global community. Each country has their own way of protecting a patient’s medical information. For purposes of the PRP Census, we comply with U.S. HIPAA regulations.  Even with assurances of confidentiality, data collection has never been an easy task.

Confidential Data – The data we collect about your unique PRP journey – and the data for all PRP patients (active and in remission) – is encrypted, password-protected, and not connected to the Internet.

De-identified Data – When shared with PRP researchers like those at Thomas Jefferson University and Yale University School of Medicine or published in the PRP Survival Guide, your data is de-identified. Simply stated, the PRP Community Database reports numbers, not names. Because your data is disassociated with your name, you have complete and total anonymity.


If you have any questions, Leave a Reply below. If not, your PRP Worldwide Census awaits.


1,621 Invited to Share PRP "Core" Data: OTR025.2

Thank You For Being Counted


I have been collecting PRP-related information from PRP patients and their caregivers since November, 2013. In the beginning it could take six requests before I received a completed PRP census form.

On the 1st and 15th of ever month the NUMBERS will be posted here.  The list will show the November 1, 2017 numbers and the most current numbers.

The numbers below are based on the “core data” shared by PRP patients and caregivers worldwide. The PRP Community Database is the most complete representation of our patient population. Thank you for sharing your information.

Bill McCue, Founder/President
PRP Alliance, Inc.


Recap as of November 1, 2017

Numbers in parentheses ( ) indicate “not providing data”

✽  Total number of PRP patients reporting:   1,629

✽  Reporting email addresses:   1,033 (596)

✽  Reporting location:   1,140 (489)

✽  Reporting onset date:  715 (914)

✽  Reporting onset age:  651 (978)

✽  Reporting diagnosis date: 694 (935)

✽  Reporting current status: 656 (973)

✽  Active:  394

✽  Remission: 262

✽  Remission date: 64 (198)

✽  Reporting standard drug therapies: 67 (1,562)

Why Donate Now?

Let’s start with a little history.

When James Shooter was admitted to St. Bartholomew’s Hospital in London, England in 1828, he unwittingly became the world’s first recorded patient with what the medical community would eventually call pityriasis rubra pilaris.

Fast forward 169 years. The PRP community has only been around since late 1997 when a group of PRP patients and caregivers traded emails on AOL. It was Jean-Luc Deslauriers, a Canadian from New Brunswick, who got the ball rolling. Our own Tierney Ratti and Ginny Maxwell’s mother were there when the PRP Support Group was established. For 16 years PRP patients and caregivers traded an average of 150 emails each month.  It was the only game in town for a while until technology caught up.

In June 2008, Jonah Grant-Scarfe, another Canadian, founded the PRP Facebook Support Group. In September 2013 it transitioned from a Public Forum into a Closed Group with about 100 members. By year’s end Tierney was the Administrator and the rest is history, Today the PRP Facebook community is nearing 1,100 members and growing. Each month a hundred discussions are started with thousands of comments and replies.  The PRP Facebook community has earned the moniker: “The Land of Chat”.

Why Now?
That’s an easy question to answer. It takes money to do the things we want to do. Are the projects and activities worth the effort — worth your donation? That’s a decision we want you to consider. Here’s how we intend to use your donation.


The first PRP Worldwide Census kicked off on November 1, 2013 with emails being sent to over 1,500 PRP members of the PRP Support Group. Unfortunately, within 24 hours, more than 500 email addresses were purged as “undelverable”. By the end of May, however the PRP Community Database had updated  records for over 1,000 PRP patients.

As of November 17, 2017, the PRP Community Database currently tracks 1,627 PRP patients of which 1,002 (62%) are members of the PRP Facebook Support Group.  The challenge we face is finding the missing data.

✽  Missing locations: 468 (29%)
✽  Missing onset dates: 868 (54%)
✽  Missing onset ages: 933 (58%)
✽  Missing diagnosis dates: 889 (55%)
✽  Missing current status: 927 (57%)

We can do a better job. The focus of the 2017 PRP Worldwide Census is to fill in the data gaps for all the datapoints including:

✽  Onset date
✽  Onset age
✽  Misdiagnoses
✽  Biopsy history
✽  Diagnosis date
Treatment (oral or injection — from a list of drugs)
 Dermatologist of record
✽  Current Status (active/remission)

The PRP Alliance will use the donations  we receive to support the 2017 PRP Worldwide Census.


During the summer of 2013, a total of 487 PRP patients/caregivers were polled by email and given an opportunity to participate in a first-ever PRP Biopsy Poll. The primary objective of the PRP Biopsy Poll was to better understand the role played by biopsies in the diagnosis of pityriasis rubra pilaris from the PRP patient perspective. There were only two questions:

✽  How many biopsies have you had that supported a PRP diagnosis?
✽  How many biopsies have you had that failed to confirm PRP?

Within a three-week period a total of 256 PRP patients/caregivers responded with the following results:

✽  Diagnoses made strictly on the basis of clinical observations — no biopsies were ordered: 7.8%
✽  The results of the biopsy provided sufficient information to support a diagnosis: 45.3%
✽  Non- conclusive biopsies were ignored when the clinical observations were  “consistent” with a PRP diagnosis: 23.4%
✽  PRP diagnosis made without the benefit of a confirming biopsy: 23.4%
✽  The PRP Biopsy Poll also suggests that when a dermatologist instructs a pathologist to consider PRP, the results nearly always confirm PRP.

It is time to revisit the issue of biopsies and the timely diagnosis of PRP. Your donation will support the 2017 PRP Biopsy Survey.


When a patient is diagnosed with PRP, the dermatologist typical prescribes medications but rarely refers the patient to the PRP Alliance, PRP Facebook Support Group, the PRP Community on RareConnect or to the PRP Survival Guide. Instead, the PRP patient is referred to Dr. Google, Dr. Yahoo or Dr. Bing to find answers and support on their own. On November 1, the PRP Alliance will begin a year-long campaign to change that practice. The PRP Dermatology Referral Initiative will advocate that patients diagnosed with PRP — or any rare skin disorder — be referred to the following websites:

  Genetic and Rare Diseases Information Center (GARD)
  National Organization of Rare Disorders (NORD)

The PRP Alliance has the support of both organizations in this effort.
PRP Treatment Efficacy Survey
The PRP community has an opportunity to collect information that could whet the appetite of PRP researchers. We hear the mantra every day: What works for one doesn’t work for all. But let’s quantify what works and what doesn’t, e.g., acitretin, methotrexate, Stelara, Cosentyx, Humira, Remicade, Otezla, Taltz, etc. The PRP Worldwide Census will identify drugs that have been prescribed, the PRP Treatment Efficacy Survey will collect information on what worked and what didn’t.

Your donation will support both the Dermatology Referral Initiative  and the PRP Treatment Efficacy Survey.


Prior to 2012 the PRP community had lamented the lack of PRP research. In October 2012, researchers at Thomas Jefferson University began genetic research with 50 participants. Their focus was on the genetic mutation of CARD14. During the summer of 2015, Dr. Jouni Uitto, Chair of the Department of Dermatology and Cutaneous Biology expanded that research. The PRP community provided 105 participants and TJU published their finding in 2016. Today both genetic and clinical research continues in Philadelphia.

The PRP community has been officially invited to participate in three major PRP research projects underway at Yale University School of Medicine. The funding for this research comes from the National Institutes of Health and the Foundation of Ichthyosis and Related Skin Types (FIRST). We are one of the “Related Skin Types”,

 Genetic research where PRP is hereditary, e.g., familial PRP
✽  PRP Patient Registry
✽  PRP Burden of Skin Disease research

Your donation will support the efforts of the PRP Alliance to recruit participants in PRP research at TJU and Yale


The PRP community newsletter was published during the period  April, 2014 to October, 2015. A total of 24 issues (598 pages) of PRP-related information was shared. The newsletter was suspended when the focus shifted to the PRP Survival Guide. It’s time to bring back the newsletter. It’s time to revive: On the Road… Our Journey from Onset through Remission .

The newsletter will mirror the organization of the PRP Survival Guide.

✽  Chapter 1 — The Basics
✽  Chapter 2 — Diagnosing PRP
✽  Chapter 3 — Treating PRP
✽  Chapter 4 — Daily Life
✽  Chapter 5 — PRP Parents and Kids
✽  Chapter 6 — Remission
✽  Chapter 7 — PRP Research
✽  Chapter 8 — PRP Advocacy

Your donation will underwrite the email distribution of On the Road… to the PRP community worldwide.

If you’ve been wondering how to help or if you’ve been wishing you could do something more, we welcome your tax deductible contribution.

If you needed some “specifics” to justify a donation, we hope that the information we provided here was enough.

The PRP Alliance is a 501(c)(3) tax-exempt nonprofit corporation. Our Employer Identification Number is 47-3868578. We will make sure that your donation receives a proper receipt for your tax records.

Click Here to donate to the PRP Alliance.

 Diagnosing PRP Survey

To better understand the role played by dermatologists and dermatopathologists in the diagnosis of PRP.

Problem to be addressed
While some PRP patients enjoy a relatively quick diagnosis of PRP, many of us have had to suffer through a differential diagnosis that preceded the “official” PRP diagnosis. During that time either the wrong treatment was administered or the appropriate treatment was delayed. Understanding the diagnosis of PRP would seem to be an important part of our journey from onset to remission,

The entire worldwide PRP community will be surveyed.

The PRP Community Database and the technical resources of Constant Contact will be used to execute the Dx PRP Survey.

Measuring Success
The original PRP Biopsy Poll was conducted in the Summer of 2013 and reported findings based on 256 PRP patients. The goal for the PRP Diagnosing PRP Survey will be a minimum of 500 participants.

Diagnosing PRP Survey

Resources Supporting PRP Patients & Caregivers

PRP Alliance.Inc.

The PRP (Pityriasis Rubra Pilaris) Alliance is a 501(c)(3), nonprofit, patient advocacy organization.Our mission is to advocate for the timely and accurate diagnosis of pityriasis rubra pilaris (PRP), the implementation of more effective and accessible treatment options, and an increase in PRP-specific research. Advocacy contacts:

Bill McCue, Founder/President
Plano, TX
Telephone: (214) 205-0574
Email: bill.mccue@prpAlliance.org

Ginny Maxwell, Director, Patient Advocacy
Lexington, SC
Telephone: 803.640.5769
Email: ginny.maxwell@prpAlliance.org

PRP Survival Guide

The PRP Survival Guide is an online repository of patient-reported experiences as reported by the PRP community. It  is offered as an alternative to unstructured and random searches by newly diagnosed PRP patients using Dr. Google, Dr. Yahoo and Dr. Bing. These efforts will almost always lead to frustration and frequently to misinformation.

If we do are job properly, you will either (1) find the answers you seek or (2) send the PRP Survival Guide editor out in search of answers to questions we haven’t asked. Eight chapters provide an organizational framework for PRP patients and caregivers:

✽  Basics
✽  Diagnosing PRP
✽  Treating PRP
✽  Daily Life
✽  PRP Parents and Children
✽  PRP & Remission
✽  PRP Research
 PRP Advocacy

PRP Facebook Support Group

Founded in April 2013, the membership in this Closed Group has grown steadily to nearly 1,100 with representation on every continent. Truely the “Land of Chat”, post a question and comments flood in. Need a hug, the huggers respond. Need a friend … there’s a community of fellow travelers ready to lend an ear or a shoulder. Need information … there are nearly 1,100 members who can share what works and what doesn’t for their unique version of PRP. We learn together. We are in this together.

PRP Community on RareConnect

The PRP Alliance supports RareConnect, an initiative of EURORDIS, the international equivalent of the National Organization of Rare Disorders. Established in April 2015, the PRP Community on RareConnect is a 200+ member, multi-language, non-Facebook option serving adults with PRP and the parents of children diagnosed with juvenile onset.

RareConnect provides a “safe, easy to use platform where rare disease patients, families and patient organizations can develop online communities and conversations across continents and languages. RareConnect partners with the world’s leading rare disease patient groups to offer global online communities allowing people to connect around issues which affect them while living with a rare disease.”

Genetic and Rare Diseases Information Center

The Genetic and Rare Diseases (GARD) Information Center is a program of the National Center for Advancing Translational Sciences (NCATS) and funded by two parts of the National Institutes of Health (NIH): NCATS and the National Human Genome Research Institute (NHGRI). GARD provides the public with access to current, reliable, and easy to understand information about rare or genetic diseases in English or Spanish.

The PRP Community advocated that all patients diagnosed with PRP should be routinly referred to GARD’s PRP Repost rather than Dr. Google, Dr. Yahoo and Dr. Bing.

National Organization of Rare Disorders

The National Organization of Rare Disorders maintains a Rare Disease Database to provide brief introductions to more than 1,200 rare diseases — including pityriasis rubra pilaris. These rare disease reports are primarily geared toward patients and families. There is also, however, an important secondary audience, e.g.,  physicians, researchers, nurses, students, journalists and others who might request and benefit from such rare disease information.

The PRP Report (circa 2017) has recently replaced the 2007 version.


Archive — NORD PRP Report Revised

From the Editor…

The light has finally been turned on.

As of September 20, the National Organization of Rare Disorders (NORD) has replaced the 2007 PRP Report with the 2017 revision. We now have a beacon of hope for PRP patients and caregivers to find as they travel the uncharted waters of pityriasis rubra pilaris.

Here are some not-so-random observations:

(1) Total word count increased by 4,010 — from to 1,274 to 5,284.

(2) One of the NORD guidelines for their rare disease reports is that they be written for the 8th grade level. We did one better. We gave one of Ginny Maxwell’s twin boys, a 7th Grader with atypical juvenile onset PRP, an opportunity to read the revision. Joey gave it a “thumbs up”.

(3) The FIRST DRAFT was made available to the PRP community via the PRP Facebook Support Group. I considered this to be my “Peer Review” by fellow PRP patients and caregivers. Comments and corrections were made as appropriate.

(4) The SECOND DRAFT was made available to dermatologists via their PRP patients. While the overall response was disappointing, the comments and corrections were incorporated as appropriate.

(5) An updated SECOND DRAFT was provided to what you might call an “Unofficial” Editorial Advisory Council. We got great response from:

✽  Mark Lebwolh, MD, Chairman, Dermatology Department, Icahn Medical School, Mount Sinai Hospital, New York, NY;

Jouni Uitto, MD, PhD Professor and Chair, Department of Dermatology and Cutaneous Biology, Thomas Jefferson University, Philadelphia, PA;

Nicholas Ross, MD, Lead Investigator and Resident Physician, Department of Dermatology and Cutaneous Biology of Thomas Jefferson University, Philadelphia, PA;

Teri Greiling, MD, PhD, Assistant Professor of Dermatology, Oregon Health & Sciences University, Portland, OR;

Kelsey Brown, Medical Writing Specialist, UCB BioSciences, Inc., Raleigh, NC; and

✽  Jan Tennant, PRP patient, former Information Analyst, Pfizer, Inc., Ringwood, NJ

(6) The FINAL DRAFT was sent to Marsha Lanes, Medical Editor for NORD Rare Disease Database. It was accepted and approved by NORD with minor formatting changes.

When a newly diagnosed PRP patient or caregiver — or even a dermatologist or other healthcare professional — looks up “pityriasis rubra pilaris”, they will find the NORD PRP Report (circa 2017) in the Top 5 and the PRP Alliance referenced in 5 of the top 10 results, e.g., (#1 of 10)  DermNet New Zealand, (#2 of 10) Medscape, (#3 of 10) National Organization of Rare Disorders,  (#4 of 10) Genetic and Rare Diseases Information Center,  (9) British Association of Dermatologists.

It has taken four years to build the lighthouse and two months to turn on the brightest light we could fine. Thanks to everyone who has supported this effort.

Next on the agenda: An eBook for PRP patients, caregivers and healthcare professionals— the logical next step for the PRP Survival Guide.

NORD PRP Report Revised

Pityriasis Rubra Pilaris Draft for NORD


NORD gratefully acknowledges the following for their assistance in preparing this report: Mark Lebwolh MD, Chairman, Dermatology Department,  Icahn Medical School, Mount Sinai Hospital, New York, NY; Jouni Uitto MD, PhD Professor and Chair, Department of Dermatology and Cutaneous Biology. Thomas Jefferson University, Philadelphia, PA; Nicholas A Ross, MD, Lead Investigator and Resident Physician, Department of Dermatology and Cutaneous Biology of Thomas Jefferson University, Philadelphia, PA; Teri Greiling MD, PhD, Assistant Professor of Dermatology, Oregon Health & Sciences University, Portland, OR; Kelsey Brown, Medical Writing Specialist, UCB BioSciences, Inc., Raleigh, NC; Jan Tennant, PRP patient, former Information Analyst, Pfizer, Inc., Ringwood, NJ; and Bill McCue, PRP patient; Founder/President, PRP Alliance; Editor, PRP Survival Guide, Plano, TX.


Devergie’s Disease
Lichen Acuminatus
Lichen Ruber Acuminatus
Pityriasis Rubra Pilaire (Fr.)
Lichen Ruber Pilaris 1-3


Type 1 — Classical Adult Onset
Type 2 — Atypical Adult Onset
Type 3 — Classical Juvenile Onset
Type 4 — Circumscribed Juvenile Onset
Type 5 — Atypical Juvenile Onset
Type 6 — HIV-associated 1-3


Pityriasis rubra pilaris (PRP) is a rare skin disorder that causes inflammation of the skin, thickening of the nails and at times shedding of the hair. The name means scaling (pityriasis), redness (rubra), and involvement of the hair follicles (pilaris).4

Typically, PRP appears first as a small spot somewhere on the face and then spreads to the back and the rest of the body.5

It may impact different parts of the body in different ways for unpredictable periods of time.5 The inflammation may cover the entire body or just parts of the body such as the elbows, knees, palms, and soles.6 The disease may progress and leave distinct areas of uninvolved skin, the so-called “islands of sparing” or “skip areas”.7

The classic adult type, the most prevalent subcategory, had previously been reported to resolve within three years. The largest case series to date, however, demonstrated that courses are often much longer than this. The pediatric type, tends to be a more protracted course.36

The peak onset years of PRP are in the first, sixth and seventh decades of life. While it most commonly affects adults, there is a significant proportion of pediatric patients affected. The disorder favors no gender.8

There are five types of PRP, which are classified based on age of onset and body areas affected. The sixth type of PRP, or HIV associated, has been more recently described but is still debated. PRP usually occurs at random, but some forms may be hereditary.9

While the exact prevalence and incidence are unknown, there are an estimated 800+ “active” patients in the U.S. and less than 1900 patients in Europe. PRP is an ultra-rare skin disorder. In fact, it is considered an orphaned disease. The rarity of PRP notwithstanding, the signs and symptoms of PRP often mimic those of eczema (31.6 million patients) and psoriasis (8 million patients).10-11

PRP patients and their caregivers quickly learn that every case of PRP is unique.4 Unfortunately, there is no specific or consistently effective therapy for PRP. In fact, there are no treatments approved by the US Food and Drug Administration (FDA) or the European Medicines Agency (EMA) for use in PRP.12 Nevertheless, experts tend to use a multimodal approach including topical and systemic therapies to control the symptoms of the disorder. Topical therapies can reduce skin (cutaneous) inflammation and aid with itch (pruritus) and dryness/flaking (xerosis). Systemic therapy can reduce inflammation and is generally required in the majority of patients with large body surface areas of involvement.12


When James Shooter was admitted to St. Bartholomew’s Hospital in London, England in 1828, he unwittingly became the world’s first recorded patient with what the medical community would eventually call pityriasis rubra pilaris. In 1828, however, Mr. Shooter’s skin disorder did not yet have a name. Seven years passed before Claudius Tarral, a French dermatologist, wrote about the case in Traite theorique et pratique des maladies de la peau (Treatise on Skin Diseases) in 1835. Tarral saw it as a variant of psoriasis.13-14

It would take another 21 years for Marie Guillaume Alphonse Devergie, a dermatologist and forensic doctor at St. Louis Hospital in Paris, to publish the most complete description of PRP. In fact, it is considered to be the “original description” of PRP by the medical community. Devergie’s article was published in the Gazette Hebdomadaire de Medecine et de Chirurgie in 1856.14

While Devergie saw the skin disorder as a combination of “follicular lesions and psoriasis palmaris, pityriasis capillitii and pityriasis rubra”, it would take yet another 21 years before another Frenchman and dermatologist by the name of Richaud to recognize PRP as a distinct entity. Richaud published his paper “Etude sur le pityriasis pilaris” in 1877.15

When Ernest Besnier presented nine cases in a 120-page article published in 1889 — 12 years after Richaud, 43 years after Devergie, and 54 years after Tarral, he forever fixed the name of the disease as pityriasis rubra pilaris. Besnier too, was a Frenchman and dermatologist. He was also the medical director of the St. Louis Hospital in Paris — the same hospital as Devergie.16 The name comes from three Latin words: pityriasis(scale-like), rubra (red) and pilaris (hair follicles).2

Like many rare disease, the PRP community laments the snail’s pace at which PRP research progresses. What should we expect — it took 61 years just to pick the name.

Recently, the Research Group from Thomas Jefferson University’s PRP Center of Excellence has compiled the world’s largest cohort of PRP patients. With each day, new understanding of the diagnosis and management of PRP are gained; yet much work remains to be accomplished.


The terms “sign” and “symptom” are not redundant.  A sign is an indication of a medical condition that can be objectively observed by others, including healthcare professionals. In contrast, a symptom is subjective, information that is shared by the PRP patient with the healthcare such as pain, itching, fatigue. The following is a list of signs and symptoms that define the PRP.

Pre-onset Signs

Mild signs include dandruff and crusty scalp, as well as limited red patches or scaling of the skin, (eg, a “dime-sized red spot” on the forehead). The duration varies from patient to patient. At some point the patient determines that intervention of a healthcare professional is warranted, (eg, a red spot has doubled in size in less than two weeks).

Progression of Signs

Depending on the advancement of inflammation, a general practitioner or dermatologist will see signs including pink, red, or orange-red scaly patches on the skin. These patches are usually itchy. Initially, PRP patients may have the scaly patches only on some parts of the body. Patches most often occur on the elbows, knees, hands, feet, and ankles. Skin on the palms and soles may also become red or waxy and thickened with a classic orange hue (palmoplantar keratoderma). The scaly patches may eventually spread over the entire body.17 Islands of sparing can occur within the salmon-colored patches of inflammation.

Cracks (fissures) may develop within thickened skin which can be painful and make walking and using one’s hands difficult. Nails may become thickened, discolored, ridged, cluttered with debris under the free-edge and may even shed.  Hair may shed considerably due to the disorder itself or some treatments used.  Heat intolerance, protein loss and fluid imbalance can occur when the rash becomes widespread (erythroderma).4
Diagnosis is often delayed by the prolonged course of evolution of the disease and its ability to masquerade as other disorders, particularly eczema and psoriasis. Fortunately, many of the treatments for eczema, psoriasis and PRP are shared.5

Acute Stage Signs and Symptoms

A dermatologist will be able to see the signs of a body engulfed by dry, red, and flaking skin, swollen feet and legs, and cracked and bleeding hands and feet. There may be serious issues related to impaired mobility, eyes and vision (caused by tightness and pulling of the eyelids), and dexterity. The PRP patient will see symptoms of PRP from a different perspective, eg, pain of motion, unrelenting itch (pruritus), and heat intolerance. Pruritus, pain, and sleep disturbance are common with this disorder. The Acute Stage poses the greatest challenge to body, mind, and spirit and can last anywhere from less than a month or many months longer. This is the time in the PRP journey that PRP patients and caregivers should seek support from patient support groups. It is also a time to address issues of depression.5

Management Stage

After the Acute Stage, the journey of a PRP patient takes on a new focus — mitigating and managing symptoms. Potential irritants are waiting on the roadside, eg, joint pain, clogged ears, and disability claims, to name a few. While 90% of the PRP patient population can look forward to full remission within one to five years, the timetable is not certain. Those diagnosed with atypical adult onset and atypical juvenile onset, the chronic versions of PRP, must develop long-term coping skills. For everyone, the daily routine associated with medications, moisturizing, and dealing with the challenges of body, mind and spirit of this skin disorder cannot be ignored.

Remission & Healing Milestones

The medical community defines remission as the disappearance of signs and symptoms of disease, whether through the use of medication or naturally with time. Recovery is considered the restoration of health or function. The PRP community has adopted a more celebratory approach to disease recovery with recognition of healing milestones. The return of sweat, the first trip out of the house for groceries, and dark hardwood floors that don’t need hourly vacuuming are all cause to celebrate. These milestones are symptoms of healing that PRP patients and caregivers feel and signs that everyone else observes.Causes

The specific underlying cause of PRP is unknown, although a combination of a genetic predisposition, environmental trigger, and other unknown causes is believed to play key roles. Vitamin A deficiency was once believed to be related to the disorder, however, this theory lacks sufficient evidence and treatment with Vitamin A has been less than effective.36, 38


Based on conversations within the PRP community, we can say with metaphysical certitude that PRP isn’t a punishment for misbehavior or forgetting to put the toilet seat down. There are thousands of perfectly wonderful people who have — or had — PRP. Moreover, there are many very bad people who don’t have it. Who then gets the short end of this rare disease stick?

Prevalence: In March 2003, Dr Andrew Griffiths delivered a “Dowling Oration” to members of the British Association of Dermatology assembled in Liverpool, England. Dr Griffiths reflected on 35 years of diagnosing, treating and researching pityriasis rubra pilaris. He unilaterally guessed the PRP prevalence rate at one in 400,000 persons. While the methodology used by Dr Griffiths is subject to debate, dermatologists worldwide have used his estimate due to a lack of evidence-based studies of how often diseases occur in different groups of people and why (epidemiology).1

Age: Pityriasis rubra pilaris is a rare disorder that may develop during childhood or adulthood. Juvenile onset accounts for 45% of the “active” patient population while adult onset accounts for 55%.6 Although PRP may occur at any age10, it most commonly affects those in their first, second, fifth, and sixth decades of life.24, 2

Gender: PRP appears to occur in males and females in relatively equal numbers. However, in childhood, the male to female ratio is 3:2.25

Race: Persons of any race may be affected.2, 7

Acquired or Inherited: PRP is usually sporadic (occurring randomly) but some forms may be herediatry.6, 2


Symptoms of the following disorders can be similar to those of pityriasis rubra pilaris. Comparisons may be useful for a differential diagnosis:

Psoriasis: According to the National Psoriasis Foundation, “Psoriasis is an immune-mediated disease that causes raised, red, scaly patches to appear on the skin. It typically affects the outside of the elbows, knees or scalp, though it can appear on any location. Some people report that psoriasis is itchy, burns and stings. Psoriasis is associated with other serious health conditions, such as diabetes, heart disease and depression.” More information is available at the NPF website.26

Atopic dermatitis (Eczema & Dermatitis): There are different types of eczema that collectively affect more than 30 million Americans: atopic dermatitis, contact dermatitis, dyshidrotic eczema, hand eczema, neurodermatitis, nummular eczema and stasis dermatitis. For more information contact the National Eczema Foundation.27

Allergic reaction: Most skin allergic reactions are minor, such as an eczema-like rash from poison ivy, or mosquito or other bug bites, or sneezing from hay fever. The type of reaction depends on the person’s immune system response, which is sometimes unpredictable. For more information about allergic reactions, go to eMedicineHealth.28

Pityriasis rosea: Pityriasis rosea (PR) is a benign rash, a common skin disorder observed in otherwise healthy people, most frequently found in children and young adults, that is thought to be caused by a mild viral infection. It usually goes away without treatment after a few months. It can easily mimic types of similar skin eruptions including lichen planus, psoriasis, and pityriasis rubra pilaris. Pityriasis rosea has a very specific and recognizable rash. It does, however, begin with a “herald mark”. Follow the link listed in the reference section for additional information at Medscape.29

Fungal infection: Mycoses are fungal infections of the skin. They are common and generally mild. However, in very sick or otherwise immunosuppressed people, fungi can sometimes cause serious disease.30

Lupus: Lupus is a chronic autoimmune disease that can damage any part of the body including skin, joints and organs. “Chronic” means that the signs and symptoms tend to last longer than six weeks and often for a lifetime. In lupus, something goes wrong with the immune system. Normally our immune systems produce proteins called “antibodies” which protect the body from invaders. “Autoimmunity” means your immune system cannot tell the difference between these foreign invaders and your body’s healthy tissues. As a result, it creates autoantibodies that attack and destroy healthy tissue. When someone has lupus, these autoantibodies cause inflammation, pain, and damage in various parts of the body.31

Cutaneous T-cell lymphoma: On occasion, the diagnosis of a PRP patient has been changed to cutaneous T-cell lymphoma (CTCL). Chronic inflammation in the skin occurs in PRP and other inflammatory skin diseases like psoriasis and eczema and can even trigger CTCL after many years. The PRP community recommends that appropriate tests which may include skin biopsy and blood work be performed to rule out CTCL. 32


A medical diagnosis is based on information from sources such as findings from a physical examination, an interview with the patient, family or both, a medical history of the patient and family, and clinical findings as reported by laboratory tests and radiologic studies.

A differential diagnosis is a process of weighing the probability of one disease versus that of other diseases.  It represents an alternative diagnosis based on the clinical and pathologic features of the patient.

Pityriasis rubra pilaris is not easy to diagnose. In March 2003, English dermatologist Dr. Andrew Griffiths reinforced that fact when he titled his Dowling Oration to the British Association of Dermatologists “Pityriasis Rubra Pilaris — The Scarlet Pimpernel”. Griffiths quoted author Baroness Orczy’s character who says: “They seek him here, they seek him there, that damned elusive Pimpernel.” We agree with Griffiths, “This disease remains an enigma.”1

The Diagnostic Role of the Dermatologist

Clinical observation is where it all begins. What symptoms are visible to the dermatologist during the examination? A dime-sized red spot on a forehead can reasonably be diagnosed as seborrheic dermatitis. Similarly, a patient “in full bloom” presenting with 90% of the skin covered with redness and scale, islands of sparing, and other key indicators might be more than enough to awaken a memory of a grand rounds experience years earlier in medical school.

The Diagnostic Role of the Dermatopathologist

The microscope is where the clinical observations are either supported or not. Biopsies sent to a dermatopathologist are often used to “rule out” specific skin maladies or causes. The PRP community has learned from shared experiences — albeit anecdotal — that when the dermatologist suspects PRP and instructs the dermatopathologist to “consider PRP,” that the findings support the clinical observations. Special tests can be performed on the skin biopsy to rule out the possibility of cutaneous lymphoma which can mimic PRP at the microscopic level (histology).

Nevertheless, the signs of PRP under the microscope are neither sensitive (the ability to pick up a diagnosis when using a test) nor specific (not? shared by many other disorders as well) to PRP. As such, the diagnosis of PRP remains largely a clinicopathologic correlation, that is to say piecing together the clinical and pathologic features to make the “best fit” of a diagnosis based on the patient’s presentation.

Differential Diagnosis

A differential diagnosis is the method by which a physician determines what disease process has caused a patient’s symptoms. The physician considers all relevant potential causes of the symptoms and then eliminates alternative causes based on a physical examination, clinical tests and a thorough case history.33

The International Center for Toxicology and Medicine states, “A differential diagnosis is a quest for a diagnosis. What is wrong with the patient internally? It is not, inherently, a search for the ultimate cause (critical to liability) of that disease process or disorder.”34  It is “the process of weighing the probability of one disease versus that of other diseases possibly accounting for a patient’s illness.”35


Treatment of pityriasis rubra pilaris is mainly anecdotal, based on case reports and case series, a feature shared by many disorders in dermatology due to their rarity. The fleeting nature of the large proportion of PRP symptoms also makes it difficult to study in standardized, long-term therapeutic studies. As controlled trials are lacking, the effectiveness and safety of treatments is unclear. Thus, there is low quality evidence supporting treatment strategies of PRP. Currently there are no treatments approved by the US Food and Drug Administration or the European Medicines Agency for use in PRP.9

PRP tends to follow a natural waxing and waning course, with episodes in which there is periodic worsening (exacerbation) or cessation (remission) of symptoms. Thus, according to many researchers, it may be difficult to evaluate the effectiveness of particular therapies.9

The value of treatment is difficult to assess, as the clinical course is so variable for each of the different types of PRP. Patients with classical adult onset PRP, for example, may present with intense and widespread reddening of the entire skin surface (erythroderma). Hospital admission for skin care, fluid replacement and other supportive care may be warranted.6

From the patient perspective, there are two major objectives in the treatment of pityriasis rubra pilaris:

✽  relieving symptoms as they present

✽  achieving long-term remission, if possible. The mantra heard within the PRP community is simple but deafening: What works for one doesn’t work for all.


Management of PRP often involves systemic and topical therapies combined. Topical therapies can help with the symptoms and may be enough for people with mild PRP. Topical treatments are usually combined with systemic therapy for PRP that affects a large part of the body. Most PRP patients need systemic therapy to control the condition.9

Treatment options will vary based on age, geography, and cost to the patient. Moreover, laboratory tests are important to monitor the effects of medications on the body — especially the liver — and to manage and monitor the side effects of drugs.

Some of the medications used to treat PRP can harm a developing fetus and are not recommended for use right before or during pregnancy.9

People seeking information about specific treatment options for themselves or family members should speak with their health care provider.9

Oral retinoids are derivatives of vitamin A that slow the growth and shedding of skin cells. Treatment options include acitretin / Soriatane® and isotretinoin / Accutane®, though researchers at the PRP Center of Excellence prefer acitretin over isotretinoin and etretinate. Oral retinoids (synthetic vitamin A derivatives) are the first line systemic treatment for PRP.9 A scientific survey of patients with PRP performed by researchers at Thomas Jefferson University published that oral retinoids were helpful in approximately 60% of patients with PRP.36


Immunosuppressants slow down the body’s immune system. These can be used in combination when oral retinoids are ineffective. Treatment options (oral and injection) include methotrexate, cyclosporine, TNF-alpha inhibitors, IL-12/23 inhibitors, among others. Methotrexate was reported to be helpful in approximately 50% of patients with PRP.36

Biologicals are also immunosuppressants. Biologicals are injectable or intravenous (IV) medications that target various pathways of inflammation in the body. With generally fewer side effects, biologicals are targeted to reduce inflammation. Treatment options include adalimumab / Humira®, etanercept / Enbrel®, infliximab / Remicade®, ustekinumab / Stelara®, secukinumab / Cosentyx®, ixekizumab / Taltz®, brodalumab / Siliq®, guselkumab / Tremfya®, and apremilast / Otezla®. These biologic medications are FDA-approved for psoriasis but improvement or remission for some patients with PRP have been published in the medical literature.


✽  Topical creams that contain urea or ammonium lactate decrease scaling and flaking of the skin. Topical corticosteroid creams decrease skin inflammation. These are applied  directly to the skin.

✽  Oral vitamin A. This may be helpful in some people, but only in very high doses that may cause toxicity. Retinoids (synthetic derivatives of vitamin A) are safer and more effective and more commonly used than high-dose vitamin A.8

✽  Traditional Chinese Medicine and other Alternative Medicines with varying degrees of success.


Depending on the severity, duration and array of signs and symptoms, PRP patients seek the expertise of specialized healthcare professionals:

✽  Opthamologist: ectropion (eyelids are turned outward) and impaired vision

✽  Podiatrist: impaired mobility

✽  Otorhinolaryngologist (ENT specialist):  impaired hearing, removal of ear wax (cerumen) from ear canal.

✽  Hepatologist: monitor impact of PRP treatment on the liver.

✽  Psychiatrists/Clinical Psychologist: depression and mental wellness

  •  PRP patient support resources: (see Resources) further information on patient care and tools see www.survivalguide.org


The Department of Dermatology and Cutaneous Biology located at Sidney Kimmel Medical College at Thomas Jefferson University (Philadelphia, PA) began genetic research in October 2012 studying CARD14 gene mutations in relation to PRP. Dr Jouni Uitto, Professor and Chair of Dermatology, was part of an earlier research effort in Tel Aviv that did not find a causal relationship between these mutations and PRP, but did discover a “genetic basis” for PRP.  In July 2014, the genetic analysis research effort was expanded to include a clinical analysis component. The PRP Alliance helped recruit a cohort of over 100 PRP patients and Thomas Jefferson University has the full cooperation and support of the PRP community. Thomas Jefferson University is also seeking separate funding to build a PRP Patient Registry. No start date has been established. For information about PRP research, contact: www.prpSurvivalGuide.org.37

Information on current clinical trials is posted on the Internet at www.clinicaltrials.gov. All studies receiving U.S. government funding, and some supported by private industry, are posted on this government web site.

For information about clinical trials being conducted at the NIH Clinical Center in Bethesda, MD; Contact the NIH Patient Recruitment Office:

Toll free: (800) 411-1222
TTY: (866) 411-1010

Email: prpl@cc.nih.gov.

For information about clinical trials sponsored by private sources, contact: www.centerwatch.com.


EURORDIS — Rare Diseases Europe
Plateforme Maladies Rares
96 rue Didot
Paris, 75014 France
Website: http://www.eurordis.org
Email: eurordis@eurordis.org

Foundation for Ichthyosis & Related Skin Types (FIRST)
2616 N Broad Street
Colmar, PA 18915 (USA)
Phone: (215) 997-9400 Toll-free: (800) 545-3286
Email: info@firstskinfoundation.org
Website: http://www.firstskinfoundation.org

PRP Alliance, Inc.
1500 Commerce Drive
Plano, TX 75093-2640 USA
Phone: (214) 205-0574
Email: bill.mccue@prpalliance.com
Website: http://www.prpAlliance.org


Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126, USA
Phone: (301) 251-4925 Toll-free: (888) 205-2311
Website: http://rarediseases.info.nih.gov/GARD/

PRP Center of Excellence
Department of Dermatology & Cutaneous Biology
of Thomas Jefferson University
833 Chestnut Street, Suite 740
Philadelphia PA 19107
Phone 216-955-6680
Email: PRP@jefferson.edu

PRP Community on RareConnect
Zürich, Switzerland; Barcelona, Spain
Website (PRP): www.rareconnect.org
Email:  rareconnect@prpSurvivalGuide.org

PRP Facebook Support Group
Virginia Beach, VA, USA
Website (PRP): www.facebook.com
Email: facebooksg@prpSurvivalGuide.org

PRP Survival Guide
Plano, TX, USA
Email: editor@prpalliance.com
Website: http://www.prpSurvivalGuide.org


In the FINAL DRAFT, the references under the NORD-required headings: Textbooks, Journal Articles and From the Internet.

1. Griffiths WA. Edited version of the Dowling Oration delivered to the British Association of Dermatologists in Liverpool, England. March 2003. http://prpsurvivalguide.org/wp-content/uploads/2017/05/Dowling-Oration-2003-Liverpool-England.pdf Accessed August 7, 2017.

2. Paravina M, Ljubenovic M, Milosavljevic M, et.al. Pityriasis rubra pilaris: A report of two cases and literature review. https://www.degruyter.com/downloadpdf/j/sjdv.2015.7.issue-4/sjdv-2015-0016/sjdv-2015-0016.pdf. Serbian J Dermatol Venereol. 2015; 7 (4): 181-194 DOI: 10.1515/sjdv-2015-0016. Accessed August 7, 2017.

3. ICD!)Data.com.  http://www.icd10data.com/ICD10CM/Codes/L00-L99/L40-L45/L44-/L44.0 Accessed August 7, 2010.

4. British Association of Dermatologists. Pityriasis rubra pilaris leaflet. http://www.bad.org.uk/shared/get-file.ashx?id=116&itemtype=document  Updated May 2016. Accessed August 7, 2017.

5. PRP Survival Guide. Chapter 1 — The Basics.  http://prpsurvivalguide.org/2017/05/19/yayaya/?trashed=1&ids=3 Accessed August 7, 2017.

6. DermNet New Zealand. Pityriasis rubra pilaris.  www.dermnetnz.org/topics/pityriasis-rubra-pilaris/ Updated October, 2015. Accessed August 7, 2017.

7. Medscape.com. Pityriasis rubra pilaris. http://reference.medscape.com/article/1107742-overview Updated April 17, 2017. Accessed August 7, 2017.

8. Healthline.com. Pityriasis rubra pilaris.  http://www.healthline.com/health/pityriasis-rubra-pilaris#Introduction1 Reviewed June 9, 2016. Accessed August 7, 2017.

9. Genetic and Rare Disease Information Center. Pityriasis rubra pilaris. https://rarediseases.info.nih.gov/diseases/7401/pityriasis-rubra-pilaris Updated August 1, 2017. Accessed August 7, 2017.

10. National Eczema Association. Eczema Facts. https://nationaleczema.org/research/eczema-facts/ Accessed August 7, 2017.

11. National Psoriasis Foundation. About the National Psoriasis Foundation. https://www.psoriasis.org/about-us Accessed August 7, 2017.|

12, Genetic and Rare Diseases Information Center. Pityriasis rubra pilaris. https://rarediseases.info.nih.gov/diseases/7401/pityriasis-rubra-pilaris#ref_7262 Accessed August 7, 2017.

13. Tarral C. Observation CXVIII. In Rayer P :‘Traite theorique et pratique des maladies de la peau’, Paris: Bailliere:1835: 2,158-9.

14. Devergie MGA. Pityriasis rubra pilaris, maladie de peau non decrite par les dermatologists. Gazette Hebdomadaire de Med. et de Chirurg. 1856;3:197-201.

15. Richaud A,  Féré C. Etude sur le pityriasis pilaris [dissertation]. Paris: A Parent; 1877.

16. Besnier E. Observations pour server a l’histoire clinique du pityriasis rubra pilaire (pityriasis pilaris de Devergie et de Richaud). Ann Dermatol 2nd series 1889;10: 253-87, 398-427, 485- 544.

17. Healthline.com. Pityriasis rubra pilaris. http://www.healthline.com/health/pityriasis-rubra-pilaris#causes3 Reviewed June 9, 2016. Accessed August 7, 2017.

18. Healthline.com. Pityriasis rubra pilaris. http://www.healthline.com/health/pityriasis-rubra-pilaris#types2 Reviewed June 9, 2016. Accessed August 7, 2017.

19. Genetic and Rare Diseases Information Center. Pityriasis rubra pilaris.  https://rarediseases.info.nih.gov/diseases/7401/pityriasis-rubra-pilaris Accessed August 7, 2017

20. Medscape.com. Pityriasis rubra pilaris.   http://reference.medscape.com/article/1107742-overview#a5 Updated April 17, 2017. Accessed August 7, 2017.

21. MedlinePlus, US National Library of Medicine. Pityriasis rubra pilaris.  https://medlineplus.gov/ency/article/001471.htm Updated July 5, 2017. Accessed August 7, 2017.

22. New Medical.net. Pityriasis rubra pilaris skin condition. http://www.news-medical.net/health/Pityriasis-Rubra-Pilaris-Skin-Condition.aspx Updated May 26, 2016. Accessed August 7, 2017.

23. National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). Understanding autoinflammatory diseases. https://www.niams.nih.gov/Health_Info/Autoinflammatory/default.asp January 2017. Accessed August 7, 2017.

24. Judge MR, McLean WHI, Munro CS. Disorders of keratinization. In: Burns T, Breathnach S, Cox N, Griffiths C, editors. Rook’s textbook of dermatology. 8th ed. Oxford: Blackwell Publishing Ltd; 2010. p. 19.1-19.122.

25. Sehgal VN, Srivastava G. (Juvenile) Pityriasis rubra pilaris. https://www.ncbi.nlm.nih.gov/pubmed/16650174 Int J Dermatol 2006;45(4):438-46. Accessed August 7, 2017. |

26. National Psoriasis Foundation.  https://rarediseases.org/organizations/national-psoriasis-foundation/  Accessed 2017.

27. National Eczema Association. https://nationaleczema.org Accessed 2017

28. eMedicineHealth. Allergic reaction. http://www.emedicinehealth.com/allergic_reaction/page2_em.htm#what_causes_an_allergic_reaction; 2017

29. eMedicine Medscape. http://emedicine.medscape.com/article/1107532-overview ; Reviewed April 12, 2016. Accessed August 7, 2017.

30. DermNet New Zealand. Introduction to fungal infections. https://www.dermnetnz.org/topics/introduction-to-fungal-infections/ 2003. Accessed August 7, 2017.

31. Lupus Foundation of America. http://www.resources.lupus.org/entry/what-is-lupus. Accessed August 7, 2017.

32. Cutaneous Lymphoma Foundation. https://www.clfoundation.org. Accessed August 7, 2017.

33. Committee on the Development of the Third Edition of the Reference Manual on Scientific Evidence, Committee on Science, Technology, and Law Policy and Global Affairs, FEDERAL JUDICIAL CENTER, National Academic Press, Washington, DC, page 214. https://www.fjc.gov/sites/default/files/2015/SciMan3D01.pdf Accessed August 7, 2017.

34. International Center for Toxicology and Medicine. From symptoms to liability: The distinct roles of differential diagnosis and causation assessment. http://www.ictm.com/Downloads/dri-causation.pdf. Accessed August 7, 2017

35. MedicineNet.com. Medical definition of differential diagnosis. http://www.medicinenet.com/script/main/art.asp?articlekey=2991 Reviewed May 13, 2016. Accessed August 7, 2017.

36. Ross NA, Chung H, Li Q, et al. Epidemiologic, Clinicopathologic, Diagnostic, and Management Challenges of Pityriasis Rubra Pilaris: A Case Series of 100 Patients. JAMA Dermatol. 2016:52(6):670-675. http://prpsurvivalguide.org/wp-content/uploads/2017/08/NARoss.PRP-Clinicopathologic_-Diagnostic_-Management1.pdf Accessed August 31, 2017.

37. PRP Survival Guide. Chapter 7 — PRP Research. http://prpsurvivalguide.org/2017/05/21/chapter-6-prp-research/ Updated August 1, 2017; Accessed August 7, 2017.

38. Li Q, Chung H, Ross N, et al. Analysis of CARD14 Polymorphisms in Pityriasis Rubra Pilaris: Activation of NF-κB. J Invest Dermatol. 2015;135:1905–1908. http://prpsurvivalguide.org/wp-content/uploads/2017/08/JID-PRP-Polymorphisms-NF-KB.pdf Accessed August 31, 2017.


1988, 1989, 1999, 2007, 2017

The information in NORD’s Rare Disease Database is for educational purposes only and is not intended to replace the advice of a physician or other qualified medical professional.

National Organization for Rare Disorders (NORD)
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Pityriasis Rubra Pilaris Draft for NORD