Pityriasis rosea is a common, self-limited rash that typically begins with the appearance of a solitary, enlarging, circular, pink, scaly patch - known as the “herald patch”. In the following 1-2 weeks, numerous smaller, round to oval, pink, scaly patches appear, typically on the trunk in a Christmas-tree-like distribution. Occasionally, the condition can be accompanied by a sore throat or flu-like symptoms. Because the rash can be itchy, topical steroids and/or oral antihistamines can be used for symptomatic relief. But even without any treatment or intervention, the rash and associated symptoms resolve on their own, usually in 6-10 weeks time. Though pityriasis rosea can affect individuals at any age, it is most common in teenagers and young adults. The exact cause is unknown, but scientists believe it is likely caused by a virus.
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