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Pityriasis Rosea, a Common Papulosquamous Disorder

Written by
Dr. Suvash Sahu
and medically reviewed by iCliniq medical review team.

Published on Jan 23, 2017 and last reviewed on Oct 11, 2021   -  5 min read


Pityriasis rosea is a rash that begins as an oval or large circular spot on the chest, back, or abdomen. It is called a herald patch, and it can be up to 10 centimeters. Please read the article to know more.

Pityriasis Rosea, a Common Papulosquamous Disorder


Pityriasis rosea is named from a Greek word, pityriasis (fine-scale), and Latin word Rosea (rose red) with common Christmas tree or fir tree pattern.

Pityriasis rosea (PR) will develop suddenly. It is a self-limiting eruption, which means it will subside on its own after a specified duration if not treated. It runs a unique and constant course lasting about six weeks.

What Are the Causes of Pityriasis Rosea?

The exact cause is unknown, though the following factors may be relevant:

What Are the Clinical Manifestations of Pityriasis Rosea?

In classic pityriasis rosea, the primary eruptions, also called herald patch or mother patch, are seen in 50% to 90% of cases on their covered truncal area. It reaches a diameter of a few centimeters within a few days. It is oval or round with a central, wrinkled, salmon-colored area and a darker red peripheral zone separated by a collarette of fine scales. Secondary eruption follows the herald plaque by two days to two months. It appears in crops and reaches its maximum size in about 10 days. The symmetric eruption covers the trunk, adjacent neck, and proximal parts of the extremities lasting for about 2 to 10 weeks. However, the eczematous or drug-induced eruptions may take longer to clear.

In the typical secondary rash, eruptions smaller than the primary plaque co-exist. Small plaques resemble the herald patch in miniature, along with the lines of cleavage. On the trunk, it is present with a Christmas tree pattern, and on the back in a chevron pattern. There will be small, red, and usually non-scaling papules. Itching is severe in 25% of the cases, slight or moderate in 50%, and absent in 25%.

Atypical pityriasis rosea (20%) variants may either be primary or secondary rash. Herald patch fails or does not appear at all. Sometimes, two or more herald patches appear. The secondary eruption may not appear at all or is restricted to the extremities. It is not present on the trunk (pityriasis rosea inverse),; however, involves the face, which is not a usual site, especially in children. It may be vesicular, pustular, urticaria-like, or purpuric, mainly in children. It is rarely localized or unilateral. Sometimes, there will be large lesions, confluent in a circinate pattern (rolled up leaves as in fern). The various atypical types include:

What Is the Prognosis and Prevalence of the Disease?

Course and Prognosis:

Usually self-limiting, lesions fade after 3 to 6 weeks, sometimes leaving residual hypo and hyperpigmentation, which is entirely reversible. Recurrences are unusual and may occur in 2% of the cases. Black races are more prone to recurrent pityriasis rosea.

Prevalence of Disease:

The prevalence of pityriasis rosea in the total population has been calculated as 0.12% in men and 0.15% in women, mostly in the age group of 10 to 44 years; even infant cases have been recorded. According to temperature and climate, the incidence is more in winter, though, in a few countries, it is seen more often in the hot and dry season.

How Is Pityriasis Rosea Diagnosed?

Pityriasis rosea is diagnosed by taking the blood test, and the blood picture is usually standard, but leukocyte count can be raised. The neutrophil and eosinophil counts may also rise occasionally.

In most cases, the doctor identifies pityriasis rosea by looking at the rash. The doctor takes a small scraping of the rash for testing because this condition can sometimes be confused with tinea corporis (ringworm).

What Is the Differential Diagnosis of Pityriasis Rosea?

How Is Pityriasis Rosea Treated?

What Are the Home Remedies for Pityriasis Rosea?

In order to help relieve the discomfort of pityriasis rosea, the following tips should be followed,


Frequently Asked Questions


What Causes Pityriasis Rosea?

The exact cause is unclear, but some evidence indicates that rash may be triggered by a viral infection, especially certain strains of the herpes virus. But it is not caused by the herpes virus causing cold sores, food, medicines, or stress.


How Long Does It Take for Pityriasis Rosea to Go Away?

When you have pityriasis rosea, the rash goes away without treatment. The rash disappears within 1 to 2 months, but it can take up to 5 months or longer for the skin to turn clear.


Is Pityriasis Rosea An STD?

Pityriasis rosea is not due to any type of allergic reaction. It is not a sign of any internal disease. It is neither contagious nor sexually transmitted, and so there is no reason to avoid intimate or close contact when one has this eruption.


How Do I Know That Pityriasis Rosea Is Healing?

The herald patch and the secondary rash usually clear within 12 weeks to three months. In some people, the symptoms persist for up to six months. When the rash gets healed, there may be lightening or darkening of the skin, and this will get normal without treatment in a few months.


Should You Moisturize Pityriasis Rosea?

People with pityriasis rosea should try to reduce discomfort due to baths, showers, and skincare products. Lukewarm baths and showers or bathing in cold water is needed. Apply a gentle moisturizer to the dry skin as soon as you get out of a shower or bath.


Does Sunlight Help Pityriasis Rosea?

One dose of ultraviolet (UV) light helps to stop itching and can shorten the course of pityriasis rosea. So, consider taking a sunbath for 30 minutes every day. This will make the skin pink and help in faster healing, but do this only once a day.


Is Aloe Vera Good for Pityriasis Rosea?

The home remedies for the pityriasis rosea include the use of coconut oil, neem, oatmeal, aloe vera, or catechu paste. People are advised to use lukewarm water or cold water during a shower or bath. This is because when skin becomes overheated, the rash worsens and becomes more visible.


Does Pityriasis Rosea Cause Fatigue?

Pityriasis rosea usually begins as a slightly raised, large, scaly patch, which is known as the herald patch. It appears on the chest, abdomen, or back. Before the appearance of herald patch, some people experienced fatigue, headache, fever, or sore throat.


How Do You Get Rid of Pityriasis Rosea Fast?

The following are the tips that help relieve pityriasis rosea.
- Take OTC (over-the-counter) allergy medicine (antihistamines) like Diphenhydramine (Benadryl).
- Bathe in lukewarm water or cold water.
- Take an oatmeal bath.
- Apply fragrance-free moisturizer, an over-the-counter corticosteroid cream, or calamine lotion.


Can Pityriasis Rosea Affect the Face?

It is uncommon for pityriasis rosea to occur or spread to the face. The pityriasis rosea rash most commonly occurs on the chest, trunk, or back and rarely occurs in the armpits, groin, face, or forearms. Pityriasis rosea begins as a single pink-to-red patch, and it is 2 to 5 cm in size.


Who Is at Increased Risk for Pityriasis Rosea?

People of all ages can get pityriasis rosea, and the rash happens most often in people between 10 to 35 years of age and in pregnant women.


Can Diet Affect Pityriasis Rosea?

It is said that specific dietary changes will not help treat pityriasis rosea. Still, now, some people say that antioxidant or anti-inflammatory-rich diets might help relieve itching.


Can Pityriasis Rosea Make You Feel Sick?

Pityriasis rosea affects people of 10 to 35 years of age, and the first symptom most people experience is fever or a headache. The first sign of this condition is a person feeling slightly unwell, and this feeling could include fever, some joint pain, or a headache.


What Happens if You Scratch Pityriasis Rosea?

Do not scratch pityriasis rosea. Specialists believe that scratching worsens the itching, so it is better to avoid touching the skin often.


Can You Get Pityriasis Rosea Twice?

Most people develop pityriasis rosea once, and they never get it again. But, it is possible to develop the pityriasis rosea rash more than once. It is said that between 2 to 3% of people develop the disease again.

Last reviewed at:
11 Oct 2021  -  5 min read




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