pityriasis rosea
Definition: A self-limited eruption of macules or papules involving the trunk and, less frequently, extremities, scalp, and face; the lesions are usually oval and follow the crease lines of the skin; occurs most commonly in children and young adults and is frequently preceded by a single larger scaling lesion known as the herald patch.
Synonym(s): pityriasis circinata, pityriasis maculata
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.

