Since many, if not most,<unk> s derive from HPV infections, and since the HPV vaccine before exposure to HPV prevents infection by some strains of the virus and has been shown to reduce the incidence of potentially precancerous lesions, scientists surmise that HPV vaccination may reduce the incidence of<unk> . In 2010, Gardasil was approved in the US to prevent<unk>  and pre-cancerous lesions in males and females aged 9 to 26 years. The vaccine has been used before to help prevent cervical, vulvar, and vaginal<unk> , and associated lesions caused by HPV types 6, 11, 16, and 18 in women.
Anal cancer
Genital wart
Anal fissure
Hemorrhoid
Anal fistula
Genital ulcer
Anorectal varices
Perianal cellulitis