In pityriasis rosea there are slightly raised pink, scaly lesions.
In pityriasis rosea there are slightly raised pink, scaly lesions.
Pityriasis rosea typically involves the chest, back, and abdomen. Typical lesions have a very fine, scaly surface.
Pityriasis rosea typically involves the chest, back, and abdomen. Typical lesions have a very fine, scaly surface.
This image displays a rash with slight scaling that is typical of pityriasis rosea.
This image displays a rash with slight scaling that is typical of pityriasis rosea.
This image displays very fine, scaly, oval, slightly elevated lesions typical of pityriasis rosea.
This image displays very fine, scaly, oval, slightly elevated lesions typical of pityriasis rosea.
In people with darker skin, the rash of pityriasis rosea can appear as very dark, scaly, slightly elevated lesions.
In people with darker skin, the rash of pityriasis rosea can appear as very dark, scaly, slightly elevated lesions.
In severe pityriasis rosea, numerous small bumps may run together.
In severe pityriasis rosea, numerous small bumps may run together.
This image displays a rash on the patient's trunk typical of pityriasis rosea.
This image displays a rash on the patient's trunk typical of pityriasis rosea.
In the displayed image, the large red circle on the upper chest is the
In the displayed image, the large red circle on the upper chest is the "herald patch" of pityriasis rosea.
The patches of pityriasis rosea are typically oval, often parallel to each other, and may have an edge of scaling at the outside border.
The patches of pityriasis rosea are typically oval, often parallel to each other, and may have an edge of scaling at the outside border.
Pityriasis rosea most frequently affects the trunk. A widespread salmon-colored rash with a fine scale is typical, as seen here.
Pityriasis rosea most frequently affects the trunk. A widespread salmon-colored rash with a fine scale is typical, as seen here.

Images of Pityriasis Rosea (10)

In pityriasis rosea there are slightly raised pink, scaly lesions.
Pityriasis rosea typically involves the chest, back, and abdomen. Typical lesions have a very fine, scaly surface.
This image displays a rash with slight scaling that is typical of pityriasis rosea.
This image displays very fine, scaly, oval, slightly elevated lesions typical of pityriasis rosea.
In people with darker skin, the rash of pityriasis rosea can appear as very dark, scaly, slightly elevated lesions.
In severe pityriasis rosea, numerous small bumps may run together.
This image displays a rash on the patient's trunk typical of pityriasis rosea.
In the displayed image, the large red circle on the upper chest is the
The patches of pityriasis rosea are typically oval, often parallel to each other, and may have an edge of scaling at the outside border.
Pityriasis rosea most frequently affects the trunk. A widespread salmon-colored rash with a fine scale is typical, as seen here.

Pityriasis Rosea

Pityriasis rosea (PR) is a common rash that usually occurs on the back, chest, and abdomen. It starts fairly quickly, lasts about 6-8 weeks, and is usually not itchy.

The cause of pityriasis rosea is not known, but it may be caused by infection with a virus.

Who's At Risk?

Pityriasis rosea can occur in people of any age, race / ethnicity, or sex, but it is most common in older children and young adults (those aged 10-40 years).

Signs & Symptoms

The most common locations for pityriasis rosea include the:

  • Chest.
  • Upper back.
  • Neck.
  • Abdomen.
  • Upper arms.
  • Thighs.

Pityriasis rosea usually begins with a single scaly plaque (a raised area on the skin) ranging from 2-5 cm in size. This first patch is called a “herald patch,” and it is usually located on the trunk, neck, or upper arms. The herald patch is followed 1-3 weeks later by the development of a widespread rash with smaller (0.5-2 cm) oval, scaly papules and plaques on the trunk and upper arms. These papules and plaques form a “Christmas tree” pattern on the back. In an uncommon type of pityriasis rosea, the rash may be concentrated in the armpits and groin or on the face, forearms, and shins. In lighter skin colors, the rash can be any shade of pink or red. In darker skin colors, the rash may appear dark red, purple, or darker brown than the normal surrounding skin.

Some people report feeling mildly ill (headache, stuffy nose, muscle aches) for 1-2 weeks before the herald patch forms. Additionally, some people experience itching with pityriasis rosea. Becoming overheated by exercising or taking a hot shower may increase itching or make the rash more apparent.

Pityriasis rosea goes away on its own (is self-limited), typically within 6-8 weeks, without treatment. However, the rash often leaves behind patches of lighter (hypopigmented) or darker (hyperpigmented) skin; these patches are more obvious in darker skin colors and may take months to return to their normal color.

Self-Care Guidelines

The herald patch of pityriasis rosea may be mistaken for ringworm (tinea corporis), but over-the-counter antifungal creams do not improve it. Similarly, the herald patch may look like eczema, but over-the-counter hydrocortisone creams also do not improve it.

Itching with pityriasis rosea can sometimes be reduced with:

  • Oatmeal baths.
  • Lukewarm (rather than hot) baths and showers.
  • Antihistamine pills such as fexofenadine (Allegra), cetirizine (Zyrtec), or loratadine (Claritin) in the daytime and diphenhydramine (Benadryl) at bedtime.

Other than relieving the itch, there are no self-care measures for pityriasis rosea. Although the rash should go away on its own within 6-8 weeks, see a medical professional for evaluation of any widespread rash.

Treatments

In most cases the medical professional will be able to diagnose the rash by examining your skin. If the rash is atypical, a skin biopsy may be required. These are usually performed by a dermatologist.

In addition, the medical professional may want to do blood tests for other medical conditions.

Because pityriasis rosea is benign and self-limited, no treatment is required. However, some people with pityriasis rosea have mild-to-severe itching, in which case your clinician may suggest:

  • Moisturizing creams or lotions.
  • Topical menthol-phenol lotions.
  • Prescription topical corticosteroid (cortisone) creams or lotions.
  • Oral antihistamine pills.
  • Oral corticosteroid pills or an oral antibiotic or antiviral (if the pityriasis rosea is very severe).

Visit Urgency

If you develop a patch of pink, purple, or brown scaly skin that does not respond to over-the-counter antifungal creams or hydrocortisone cream, or if you develop a widespread rash, see a dermatologist or another medical professional for evaluation.

Be prepared to discuss the following with the medical professional:

  • The course of the rash (when it started, whether or not there was a herald patch, etc)
  • What treatments, if any, you have tried
  • Whether or not any friends or relatives have a similar rash
  • Your medication history (including the names of any medications or supplements you have taken within the last month)

Trusted Links

References

Bolognia J, Schaffer JV, Cerroni L. Dermatology. 4th ed. Philadelphia, PA: Elsevier; 2018.

James WD, Elston D, Treat JR, Rosenbach MA. Andrew’s Diseases of the Skin. 13th ed. Philadelphia, PA: Elsevier; 2019.

Kang S, Amagai M, Bruckner AL, et al. Fitzpatrick’s Dermatology. 9th ed. New York, NY: McGraw-Hill Education; 2019.

Paller A, Mancini A. Paller and Mancini: Hurwitz Clinical Pediatric Dermatology. 6th ed. St. Louis, MO: Elsevier; 2022.

Disease Groups: New Itchy Skin Rashes in Adults

Last modified on May 16th, 2023 at 5:15 pm

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