Human Papillomavirus (HPV)

A type of virus that infects the skin and can cause abnormal tissue growth (for example, warts) and other changes to cells. Infection for a long time with certain types of cancer-causing HPV can result in abnormal pap smears, cervical and other types of cancer including cancer of the vulva, vagina, penis, or anus. It can also cause cancer in the back of the throat, including the base of the tongue and tonsils (which is a subset of oropharyngeal cancer).