NCIt definition : A benign, well circumscribed adnexal neoplasm arising from the intraepidermal portion
of the sweat gland duct. It usually presents as a solitary, dome-shaped papule, nodule,
or plaque on acral sites. It is characterized by a proliferation of uniform basaloid
cells in the dermis and is associated with the presence of focal ductal and cystic
structures. Complete excision is curative.;