Pityriasis rosea is a type of skin rash. Classically, it begins with a single red and slightly scaly area known as a 'herald patch'. This is then followed, days to weeks later, by a rash of many similar but smaller round or oval lesions, mainly on the trunk and upper limbs. About 20% of cases show atypical deviations from this pattern. It usually lasts less than three months and goes away without treatment. Sometimes malaise or a fever may occur before the start of the rash or itchiness, but often ...
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