Anal cancer is a rare type of cancer. The anus is where stool leaves your body when you go to the bathroom. It is made up of your outer layers of skin and the end of your large intestine. Anal cancer is a disease in which cancer cells form in the tissues of the anus.
Symptoms include bleeding, pain or lumps in the anal area. Anal itching and discharge can also be signs of anal cancer. Possible treatments include radiation, chemotherapy and surgery. Your treatment will depend whether the tumor has spread, and on the type, size and location of the tumor.
NIH: National Cancer Institute