Pityriasis rosea (PR) is a common skin condition that causes a rash similar to that seen in other skin diseases, including ringworm, psoriasis and eczema. The lesions may also be confused with those seen in people with secondary syphilis, a sexually transmitted disease.

The exact cause of PR remains unknown. Although it is not usually contagious, scientists suspect it may be caused by a virus. However, research has been unable to confirm this theory.

Most cases of PR occur in healthy individuals without signs of illness. It occurs more frequently in women than men, and usually affects children and young adults ages 10 to 35. The skin disease has a higher incidence during the spring and fall.

PR is generally benign, self–limited and does not require medical treatment. Lesions usually disappear on their own in eight to 16 weeks.