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    Pityriasis rosea

    Rash - pityriasis rosea; Papulosquamous - pityriasis rosea; Herald patch

    Pityriasis rosea is a common type of skin rash most often seen in young adults.

    Causes

    Pityriasis rosea is believed to be caused by a virus. It occurs most often in the fall and spring.

    Although pityriasis rosea may occur in more than one person in a household at a time, it is not thought to spread from one person to another. Females seem to be more affected than males.

    Symptoms

    An episode most often lasts 4 to 8 weeks. Symptoms may disappear by 3 weeks or last as long as 12 weeks.

    The rash starts with a single large patch called a herald patch. After several days, more skin rashes will appear on the chest, back, arms, and legs.

    The skin rashes:

    • Are often pink or pale red
    • Are oval in shape
    • May be scaly
    • May follow lines in the skin or appear in a Christmas tree pattern
    • May itch

    Other symptoms may include:

    • Headache
    • Fatigue
    • Sore throat
    • Mild fever

    Exams and Tests

    Your health care provider can often diagnose pityriasis rosea by the way the rash looks.

    In rare cases, the following tests are needed:

    • A blood test to be sure it is not a form of syphilis, which can cause a similar rash
    • A skin biopsy to confirm the diagnosis

    Treatment

    If symptoms are mild, you may not need treatment.

    Your provider may suggest gentle bathing, mild lubricants or cream, or mild hydrocortisone creams to soothe your skin.

    Antihistamines taken by mouth may be used to reduce itching. You can buy antihistamines at the store without a prescription.

    Moderate sun exposure or ultraviolet (UV) light treatment may help make the rash go away more quickly. However, you must be careful to avoid sunburn.

    Outlook (Prognosis)

    Pityriasis rosea often goes away within 4 to 8 weeks. It usually doesn't come back.

    When to Contact a Medical Professional

    Contact your provider for an appointment if you have symptoms of pityriasis rosea.

    Open References

    References

    Dinulos JGH. Psoriasis and other papulosquamous diseases. In: Dinulos JGH, ed. Habif's Clinical Dermatology: A Color Guide in Diagnosis and Therapy. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 8.

    James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM. Pityriasis rosea, pityriasis rubra pilaris, and other papulosquamous and hyperkeratotic diseases. In: James WD, Elston DM, Treat JR, Rosenbach, MA, Neuhaus IM, eds. Andrews' Diseases of the Skin: Clinical Dermatology. 13th ed. Philadelphia, PA: Elsevier; 2020:chap 11.

    Marks JG, Miller JJ, Hollins C. Scaling, papules, plaques, and patches. In: Marks JG, Miller JJ, Hollins C, eds. Lookingbill and Marks' Principles of Dermatology. 7th ed. Philadelphia, PA: Elsevier; 2025:chap 9.

      • Pityriasis rosea on the chest

        Pityriasis rosea on the chest - illustration

        Pityriasis rosea is a skin disease that produces oval spots (papules) over the trunk. The rash is frequently preceded by a herald patch (pictured here) lasting 1 to 2 weeks. The rash is usually rose red to brownish red with fine scales and central clearing. Itching (pruritus) occasionally occurs. Spontaneous remission occurs in 2 to 8 weeks. It is probably caused by an infectious agent, most likely a virus.

        Pityriasis rosea on the chest

        illustration

        • Pityriasis rosea on the chest

          Pityriasis rosea on the chest - illustration

          Pityriasis rosea is a skin disease that produces oval spots (papules) over the trunk. The rash is frequently preceded by a herald patch (pictured here) lasting 1 to 2 weeks. The rash is usually rose red to brownish red with fine scales and central clearing. Itching (pruritus) occasionally occurs. Spontaneous remission occurs in 2 to 8 weeks. It is probably caused by an infectious agent, most likely a virus.

          Pityriasis rosea on the chest

          illustration

        Review Date: 10/9/2024

        Reviewed By: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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