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A 57‐year‐old man presented with a 2‐year history of bilateral erosive lesions on the inguinal region, and erythematous, brown and crusted papules over the trunk. Histological examination of one lesion in conjunction with immunohistochemical study and electron microscopy led to the diagnosis of Langerhans’ cell histiocytosis. After a thorough examination, the only associated findings were retroperitoneal...