The basal-cell nevus is a dysgenetic dermatosis characterized by multiple small cutaneous
tumors. These are histologically indistinguishable from basal-cell cancer. Malignant
supervention is common, generally resulting in multiple basal-cell cancers of the face in
young adults. Developmental defects of other systems are often present. Incidence seems to
be based on an inherited, sometimes familial, predisposition. Clinical Features Basal-cell
nevi may appear at birth or be first noted in infancy. Occasionally the lesions may begin at …