Monarch Disease Ontology id MONDO_0006787 (hidrocystoma) is 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. Also known as: Hydrocystoma, apocrine/eccrine hidrocystoma, eccrine hidrocystoma of skin, hidrocystoma (morphologic abnormality).