pityriasis rosea

pityriasis rosea A common mild rash of unknown origin that may last from several weeks to several months, often beginning with a “herald” patch, a large single pink patch on the chest or back and, within a week or so, more pink patches on the torso, arms, and legs. There may be itching, especially when overheated. Treatment may include medications for the itching and soothing lotions or skin lubricants.