Non-anogenital (ectopic) hidradenoma papilliferum with sebaceous differentiation: a case report and review of reported cases.

Hidradenoma papilliferum is a benign tumor that usually occurs in the female anogenital region. We present a 52-year-old male with a non-anogenital (ectopic) hidradenoma papilliferum on his face. He had had a subcutaneous tumor on his right eyebrow for 30 years.