Molluscum contagiosum (MC) is a viral infection of the skin or occasionally of the mucous membranes. MC infects humans, other primates and kangaroos. The infecting virus is a DNA poxvirus called the molluscum contagiosum virus (MCV). There are 4 types of MCV, MCV-1 to -4, with MCV-1 being the most prevalent and MCV-2 seen usually in adults and often sexually transmitted. The incidence of MC infections in young children is around 17% and peaks between 2-12 years of age. MC affects any area of the skin but is most common on the body, arms, and legs. It is spread through direct contact, saliva, or shared articles of clothing (including towels).
In adults, molluscum infections are often sexually transmitted and usually affect the genitals, lower abdomen, buttocks, and inner thighs. In rare cases, molluscum infections are also found on the lips, mouth and eyelids.
The time from infection to the appearance of lesions ranges from 1 week to 6 months, with an average incubation period of 6 weeks. Diagnosis is made on the clinical appearance; the virus cannot routinely be cultured.