Perianal hematomas are very similar to hemorrhoids and often misdiagnosed as such. They are actually a burst blood vessel near the anus, causing a pool of blood to form underneath the skin. These bumps are usually caused by straining or trauma to the area and can be very painful. If caught within the first 48 hours or before they begin to heal on their own, they can be treated by a health care provider. Although the lump may take three months to clear up, the pain usually subsides in seven to ten days. Molluscum contagiosum is another type of bump that can occur anywhere on the body including near the anus. Despite being harmless, they can swell up and last between 6 to12 months. Mollusca can very easily spread to other parts of the body through contact. These small bumps have the tendency to heal on their own, but there are some additional treatment options available to remove them sooner. Anal cancer (link is external) is uncommon, but can also appear as a small lump in the anal canal. Other symptoms include anal bleeding, itching, or pain. The majority of anal cancers are caused by HPV. Risk factors include older age, smoking, engaging in anal sex, immunosuppressant drugs or conditions (including HIV). Anal cancer can be treated by chemotherapy, radiation, or several different surgical procedures.