TY - CHAP M1 - Book, Section TI - Chapter 42. Pityriasis Rosea A1 - Blauvelt, Andrew A2 - Goldsmith, Lowell A. A2 - Katz, Stephen I. A2 - Gilchrest, Barbara A. A2 - Paller, Amy S. A2 - Leffell, David J. A2 - Wolff, Klaus Y1 - 2012 N1 - T2 - Fitzpatrick's Dermatology in General Medicine, 8e AB - |PrintPityriasis Rosea at a GlanceCommon acute papulosquamous eruption normally lasting 4–10 weeks.Most often begins as a single 2- to 4-cm thin oval plaque with a fine collarette of scale located inside the periphery of the plaque (“herald patch”).Similar-appearing, but smaller, lesions appear several days to weeks later, typically distributed along the lines of cleavage on the trunk (“Christmas tree” pattern).Usually asymptomatic, sometimes pruritic with mild flu-like symptoms.Occurs most commonly in teenagers and young adults.Probably a viral exanthem associated with reactivation of human herpes virus (HHV)-7 and sometimes HHV-6.Treatment is usually supportive, although midpotency topical corticosteroids can reduce pruritus; high-dose acyclovir for 1 week may hasten recovery. SN - PB - The McGraw-Hill Companies CY - New York, NY Y2 - 2023/05/30 UR - accessmedicine.mhmedical.com/content.aspx?aid=56033655 ER -