Pityriasis rosea is a common skin disease and appears as a rash that can last from several weeks to several months. It most often develops in the spring and the fall, and is more prevalent in adolescents or young adults, and is uncommon in those over 60. Usually there are no permanent marks as a result of this disease, although some darker-skinned persons may develop long-lasting flat brown spots.
The skin rash follows a very distinctive pattern and varies from person to person. In most cases, a single, isolated oval scaly patch (the "herald patch") appears on the body, particularly upper part of the body, but again every individual reacts differently. This is often mistaken for ringworm or eczema. More pink patches can occur on different parts of the body, but rarely on the face.