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Chapter 72. Pityriasis Rosea

Course

The course of pityriasis rosea is repeatable and predictable; a “herald” or “mother” patch appears, usually on a trunk, followed soon afterward by an eruption of oval scaly macules that become papules that eventuate in subtle plaques. The shower of lesions, which tends to be restricted to the region from the “neck to the knees,” ceases after some days and the entire process usually wanes within six weeks. As a rule, there is no residuum.