Immunohistochemical expression of cyclooxygenage-2 in melanocytic skin lesions.

Background: Several reports have shown expression of cyclooxygenase-2 (COX-2) in malignant skin tumors. COX-2 has also recently been reported as a marker of malignant melanoma (MM).

Objective: Our aim was to investigate whether there is a difference in the immunohistochemical expression of COX-2 between malignant and benign melanocytic lesions of the skin.

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.