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What is pityriasis rosea? Pityriasis rosea (say "pih-tih-RY-uh-sus ROH-zee-uh") is a common skin problem that causes a rash. Although it can occur at any age, it is seen most often in those between the ages of 10 and 35. Pityriasis rosea is usually harmless. What causes pityriasis rosea? Experts aren't sure what causes...