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Minnesota State University, Mankato
Minnesota State University, Mankato

Pityriasis Rosea

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Pityriasis Rosea is usually a mild rash that occurs most often in adolescents and young adults, lasts from three to eight weeks, and resolves on its own without treatment.  The cause of Pityriasis Rosea is unknown but is believed to be a reaction to a viral illness.
  • It is often without symptoms.
  • The most common symptom is itching.

Pityriasis Rosea may begin with a "herald" patch, a one to three inch pink patch that may go unnoticed. A few days later the herald patch is followed by a pink rash found commonly on the trunk of the body, and occasionally on the arms and thighs.

Treatment is necessary only if itching becomes bothersome.  25 mg Benadryl can be used for daytime itching.  If the Benadryl causes drowsiness, you may try Zyrtec or Allegra.  You may use 50 mg or 100 mg of Benadryl for nighttime itching.

If the symptoms have not cleared up within six weeks, make an appointment to see your health care provider.