![]() Inflammatory bowel disease such as Crohn's disease or ulcerative colitis.An anal fissure, a tear in the anal canal, that becomes infected.Causes of Anal AbscessesĪn anal abscess can have many different causes. Surgery is needed to cure almost all anal fistulas. In other cases, where the outside of the tunnel opening closes, the result may be recurrent anal abscesses. In some cases, an anal fistula causes persistent drainage. A fistula is a small tunnel that makes an abnormal connection between the site of the abscess and the skin. Surgical incision and drainage is the most common treatment for all types of anal abscesses and is usually successful.Ībout 50% of patients with an anal abscess will develop a complication called a fistula. Anal abscesses located in deeper tissue are less common and may be less visible. It may be red in color and warm to the touch. This often appears as a painful boil-like swelling near the anus. ![]() The most common type of abscess is a perianal abscess. Most anal abscesses are a result of infection from small anal glands. An anal abscess is a painful condition in which a collection of pus develops near the anus.
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