![]() ![]() Not so rarely (20%), an atypical eruption may develop, concerning several aspects about the morphology or distribution of the lesions, their symptomatology and evolution. Its incidence has been estimated to be 0.68% of dermatologic patients, varying from 0.39% to 4.8%. In most cases, the eruption lasts for 6 to 8 wk. The secondary lesions adopt a characteristic distribution along the cleavage lines of the trunk, with a configuration of a “Christmas tree”. Few days later, a secondary eruption appears, with little pink, oval macules, with a grayish peripheral scaling collarette around them. It has a sudden onset, and in its typical presentation, the eruption is preceeded by a solitary patch termed “herald patch”, mainly located on the trunk. ![]() Pityriasis rosea (PR) is a relatively common, self-limited papulo-squamous dermatosis of unknown origin, which mainly appears in adolescents and young adults (10-35 years), slightly more common in females. ![]()
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