Trichoadenoma

**Semantic type:** Neoplastic Process

**Definition:** A rare, benign, slowly growing tumor of the hair follicle occurring usually in the face or buttocks. Morphologically, it is a well-defined dermal tumor that contains numerous cysts and epithelial islands. The cysts are lined by infundibulum-like squamous epithelial cells.

**Synonyms:** - Trichoadenoma of Nikolowski