Atypical clinical appearance and localization of trichilemmoma. a case report.

Trichilemmoma is a benign cutaneous tumor that shows characteristics of differentiation similar to the outer hair sheath. We report the case of a woman presenting with a nodular tender mass of the back that was diagnosed as an isolated trichilemmoma. Several lines of evidence suggest that trichilemmoma should be considered in the differential diagnosis of any indistinct facial papule. This report documents a non-facial example of trichilemmoma. Atypical clinical appearance and localization of this neoplasm in our patient suggest that only histological findings are specific of this tumor.