title: Nodular and pigmented skin lesions.
mesh_terms: D000293:Adolescent; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D009062:Mouth Neoplasms / Q000473:pathology*; D009456:Neurofibromatosis 1 / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*