A viral disease of the skin, characterized by one or more firm, dome-shaped nodules with a central dimple and containing a cheese-like substance. The virus is transmitted by sexual contact as well as by shared use of clothing, linen, and towels or other items that have been contaminated with the virus; outbreaks in schools are not uncommon.

For cosmetic purposes, the nodules may be unsightly, but they are not dangerous. Once diagnosed, a dermatologist can remove them with a curette or by electrodessication. The nodules can recur if the infected items are not sanitized or if a sexual contact is not treated.