This strange rash occurs in the spring and the fall and mainly strikes young adults. (I did diagnose it once in a 35 yer old woman). We think it is a virus but it doesn't seem to spread from person to person and it is usually quite isolated.
The symptoms start with a "herald patch", one larger spot that develops into a wider, pinkish, scaly rash over a week or so. The red, raised spots can last for up to 12 weeks but usually resolve by 4-8 weeks. As seen here, it is mainly on the body trunk.
There is no treatment for Pityriasis rosea except patience and antihistamines for itching.
For you wordophiles- Pityriasis comes from the Greek "bran"…