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Both sebaceous hyperplasia and nevus sebaceus of Jadassohn consist of abnormalities of sebaceous glands but the former, as the name denotes, is a hyperplasia, whereas the latter is a hamartoma that involves not only sebaceous units, but other adnexal epithelial structures, the epidermis, the dermis, and the subcutaneous fat. The lesion tends to be alopecia. […]