Sebaceous cysts

Alternative names:

epidermoid cyst; pilar cyst; vulvar cysts

Definition:

A closed sac within the tissue (typically the vulva or labia) containing oily or fatty fluid or semisolid material. This collection of material usually forms a rounded, non-tender swelling of varying size.

Causes, incidence, and risk factors:

Sebaceous cysts are caused by the accumulation of sebaceous (oily) material resulting from the blockage of a sebaceous duct or gland in the skin. They are fairly common, benign, and commonly occur on or within the labia majora, back of the neck, upper chest, and back. Most sebaceous cysts of the vulva grow slowly and remain small.