Combined skin lesions.

Four brief reports of combined skin lesions are presented: (1) combined basal cell epithelioma and histiocytosis X. (2) combined intraepidermal melanocytic neoplasia (melanoma in situ) and leukaemia cutis, (3) combined melanocytic naevus with pseudoepitheliomatous hyperplasia and desmoplastic trichoepithelioma, and (4) combined melanocytic naevus with lichenoid gold reaction. The importance of the occurrence of such lesions is discussed, as are the clinical and pathological diagnostic difficulties they sometimes pose.