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wwwsreehomeohub.net An anal fistula, also called a fistula-in-ano, is an abnormal tunnel that develops between the inside of the anal canal and the skin around the anus. It commonly develops after an infection causes an anal abscess. When the abscess drains but the abnormal channel remains, a fistula may develop. An anal fistula may cause persistent discharge, pain, swelling, irritation, recurrent abscesses and a small opening near the anus. Because fistulas generally do not