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pityriasis rosea (pit″ĭ-riŽә-sis roŽze-ә) a common, acute or subacute, self-limited, exanthematous disease of unknown etiology. It begins with a solitary red to tan plaque called the herald patch, usually on the trunk, arms, or thighs; this is followed by similar but smaller papular or macular lesions; these later may peel and leave a scaly collarette.
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