Hidrocystoma

**Semantic type:** Neoplastic Process

**Definition:** A benign cystic proliferation of the sweat glands with apocrine or eccrine differentiation. It usually presents as a dome-shaped, cystic papular or nodular lesion usually in the face and neck. It is a unilocular or mutlilocular lesion lined by an inner and an outer layer of epithelium. Complete excision is usually curative.

**Synonyms:** - Hydrocystoma