Anal Cancer

Anal cancer affects men and women, but it has a greater prevalence among men who have sex with men. About 35 in every 100,000 gay and bisexual men develop anal cancer, compared to less than one in every 100,000 heterosexual men.
Anal cancers are skin cancers. The exact cause of anal cancer is unknown.   HPV and anogenital warts are a significant risk factor. This includes past and current infections. Some strains of HPV that cause larger warts are not associated with cancer. Most men that develop anal cancer are over 50 years old, although coinfection with HIV increases the chance of early development.
Many men have no visible symptoms of anal cancer. However, because the cancer is strongly associated with HPV infection, a history of anogenital warts is likely. Although most lesions are benign, any visible anal sore or bump should be examined. They may be a sign that others have developed in the anal canal.
Other signs include the following:
Abnormal discharge from the anus
Bleeding from the rectum and anus
Itching of the anus
Pain or pressure around the anus
Sore around the anus that does not heal.

Bottom line, ask your doctor or local clinic to access your risk.