Anal Abscess Fistula
An anal abscess is a painful, infected cavity filled with pus and located near the anus or rectum. If the abscess is large, a person may develop fever, chills or a general ill feeling. An anal fistula is a small tunnel which starts inside the anus and usually exits at one or more places on the skin of the buttocks outside the anus. A fistula may cause irritation to the skin around the anus, itching or drainage of stool or mucus.