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Lichen planus and lichenoid discoid lupus erythematosus have many findings histopathologic in common, among them hyperkeratosis of surface epidermis and plugs of cornified cells in infundibular epidermis; individual necrotic keratocytes; a lichenoid infiltrate of lymphocytes that, in conjunction with vacuolar alteration, obscures the dermoepidermal junction, and melanophages in the papillary dermis. The finding that is […]