Photo by Grook Da Oger [GFDL ( or CC-BY-SA-3.0-2.5-2.0-1.0 (], via Wikimedia Commons.

Pityriasis Rosea

Signs: Most often, a pityriasis rosea rash starts with a large, red patch on the trunk (as seen in the picture). After a week or two, smaller, pink, oval patches appear, usually only on the trunk and arms. The rash is flat or slightly raised and sometimes scaly. It also may itch. (Learn more here.)

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Note: This is just an example. The rash may appear differently, and it’s easy to confuse one rash for another.