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Nevus verrucosus and acanthosis nigricans are processes that affect the papillary dermis and the epidermis. Both conditions may display hyperkeratosis, epidermal hyperpigmentation, papillomatosis, melanophages, and an increased number of fibrocytes in a thickened pale-staining papillary dermis. Whereas nevus verrucosus is fundamentally an epidermal nevus with a rough surface, acanthosis nigricans is basically a connective tissue […]