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Pityriasis rosea is a common dermatosis named by Gibert in 1860. It is an acute self limiting papulosquamous disease, probably infective in origin affecting healthy adolescents and young adults. It is characterized by distinctive skin eruptions and minimal constitutional symptoms. Drug induced pityriasis rosea tend to occur in older generation and resolution seen only after withdrawal of the offending drug. We report a case of 12-year-old boy with erythematous papules distributed over trunk and proximal arms after nimesulide therapy consistent with a clinical diagnosis of atypical pityriasis rosea. The relation of drug and development of pityriasis rosea is confirmed by dechallenge test of the suspected drug.