A benign neoplasm arising from the sweat glands. It presents as a slow growing cystic nodular lesion most often in the skin of the vulva and the perianal region. It is characterized by the presence of cystic and large papillary structures. The papillary structures contain connective tissue and are covered by two layers of epithelium. Complete excision is curative. The disease is papillary hidradenoma (Monarch Disease Ontology entry MONDO_0003446). Also known as: hidradenoma papilliferum.