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Colonization of nonmelanocytic cutaneous lesions by dendritic melanocytic cells: A simulant of acral‐lentiginous (Palmar‐plantar‐subungual‐mucosal) melanoma

Four cases of colonization of nonmelanocytic lesions by dendritic melanocytic cells are reported, one in a verruca vulgaris of the lip, one in a squamous cell carcinoma in situ of mucous membrane overlying a tonsil, one in a lesion of lichen simplex chronicus with a nevocellular nevus of the external ear, and one in a dermatofibrosarcoma protuberans (Bednar tumor). This is an important biological process of melanocytes that must not be confused with the acral‐lentiginous (palmar‐plantar‐subungual‐mu‐cosal (P‐S‐M) melanoma. It is probably much more common than the paucity of published reports would indicate.