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.
ByHealthwise Staff Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine Specialist Medical ReviewerRandall D. Burr, MD - Dermatology
E. Gregory Thompson, MD - Internal Medicine & Randall D. Burr, MD - Dermatology
This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the
How this information was developed to help you make better health decisions.