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Universal acquired melanosis or "carbon baby" syndrome is an exceedingly rare type of progressive hyperpigmentation of unknown etiology occurring in children.The darkening of the skin starts in the first few months of life on the face and limbs and gradually progresses to involve the entire body surface. On histopathology, there is heavy melanin deposition in the basal and suprabasal layers of the epidermis and presence of melanophages in the dermis
