Steatocystoma multiplex is a disorder of the pilosebaceous unit that occurs in either a sporadic or an autosomal dominant manner. Numerous hamartomatous malformations of the pilosebaceous duct junction (hair follicle unit) develop at puberty.
If a single cyst of this type is found, it is called Steatocystoma Simplex. Lesions usually appear in adolescence or early adulthood, when sebaceous activity is at its peak. Both males and females may be affected. The cysts of steatocystoma multiplex most often arise on the chest and may also occur on the abdomen, upper arms, armpits and face. In some cases, cysts may develop all over the body.
Localized, generalized, facial, acral, and suppurative types of steatocystoma multiplex have been described. Isolated steatocystoma of the vulva and scrotum can develop late in life as a sporadic condition not inherited.
The cysts are mostly small (2-20 mm) but may be several centimetres long. They tend to be soft to firm semi-
translucent bumps, and contain an oily, yellow liquid. Sometimes a small central punctum can be identified, and it may contain one or more hairs (eruptive vellus hair cysts).
These cysts can be removed using CO 2 laser in a single session.