Updated May 27, 2011.
Pityriasis rosea is a common, itchy rash that resolves on its own. Often the rash starts with a "herald patch" as seen here. A herald patch is a single 2- to 10-cm round/oval lesion that often occurs on the trunk. The herald patch often looks like ringworm. Within a few days to several weeks, smaller lesions appear mainly on the trunk but can spread to the arms, legs, and face.
Pityriasis rosea is a common, itchy rash that resolves on its own. Often the rash starts with a "herald patch" as seen here. A herald patch is a single 2- to 10-cm round/oval lesion that often occurs on the trunk. The herald patch often looks like ringworm. Within a few days to several weeks, smaller lesions appear mainly on the trunk but can spread to the arms, legs, and face.