title: Blue nevus.
mesh_terms: D001706:Biopsy; D002471:Cell Transformation, Neoplastic; D002648:Child; D005528:Foot; D006801:Humans; D008297:Male; D009508:Nevus, Pigmented / Q000473:pathology; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology