[Sebaceous trichofolliculoma].

A 20 year old male patient is reported who has, since the childhood, two adjacent, slightly depressed, orifices on the midline of the dorsum of the nose through which a few hairs came out. The histology of the excised lesion revealed a central cystic cavity, open to the surface, in which converge multiple mature hair follicles, either of vellus and terminal types. There are conspicuous, well developed sebaceous glands. No secondary or tertiary hair follicles could be found and hair shafts are often thick, long and pigmented. The differential diagnosis is discussed, particularly with the trichofolliculoma and the fistula of the dorsum of the nose. The lesion shares most of the features of this last lesion and probably is a superficial variety of fistula of the dorsum of the nose. The lesion is quite different from the classical type of trichofolliculoma and the name sebaceous trichofolliculoma is considered to be an inadequate one.