Molluscum contagiosum is a chronic skin infection caused by a virus that is part of the pox virus family. It causes small, wart-like bumps on the skin. The bumps may last from a few months to a few years. The virus is contagious through direct contact and is more common in children. However, the virus also can be spread by sexual contact and can occur in people with weak immune systems, such as those with HIV/AIDS. Follow the links below to find WebMD's comprehensive coverage about how molluscum contagiosum is contracted, what it looks like, how to treat it, and much more.