Herald patch in pityriasis rosea

Picture of a herald patch in pityriasis rosea

Pityriasis rosea (say "pih-tih-RY-uh-sus ROH-zee-uh") is a common skin problem that causes a rash. The rash often begins with a herald patch—a single, round-to-oval, pink patch that is scaly with a raised border. The size of the patch ranges from 2 cm (0.8 in.) to 10 cm (3.9 in.). A larger patch is more common.

Pityriasis rosea is usually harmless. But it can cause serious problems in pregnant women.

Last Updated: November 9, 2009

Author: Bets Davis, MFA

Medical Review: Anne C. Poinier, MD - Internal Medicine & Femi Olatunbosun, MB, FRCSC - Obstetrics, Gynecology and Reproductive Medicine

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