Pityriasis Rosea
Pityriasis rosea (PR) is a condition characterized by the appearance of circular or oval scaling patches distributed all over the body. While mainly on the trunk and sparing the face, variants have been described where the face and arms are the primary sites affected. These skin lesions may be itchy, but are more often asymptomatic. Characteristically, the full body eruption of pityriasis rosea is preceded by one single scaling patch ("herald patch") 2-3 days before the rest of the rash appears.
The cause of pityriasis rosea is unknown, but felt to be due to a viral infection. Indeed, a preceding upper respiratory tract infection is seen in many patients 2-3 weeks before the initial eruption appears. It is not contagious. The treatment of pityriasis rosea mainly consists of topical steroids, moisturizers, and oral antihistamines. Pityriasis rosea usually spontaneously remits in about 6-8 weeks without any scarring.
Don Mehrabi MD, FAAD
Dermatologist, Certified by the American Board of Dermatology
Los Angeles, California
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