Most anal fistulas form in reaction to an anal gland that has developed a pus-filled infection abscess. Even if your abscess drains on its own, you have about the same risk for a fistula. Certain conditions that affect your lower digestive tract or anal area may also increase your risk. These include:. The specialist will ask about your symptoms and your medical history. During your physical exam, the doctor will look for a fistula opening near your anal opening.
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ANAL ABSCESS AND FISTULA
An anal fistula also called fistula-in-ano is a small tunnel that tracks from an opening inside the anal canal to an outside opening in the skin near the anus. An anal fistula often results from a previous or current anal abscess. However, a fistula can also occur without an abscess. Small glands just inside the anus are part of normal anatomy. If the glands in the anus become clogged, this may result in an infection. When the infection is serious, this often leads to an abscess. Bacteria, feces, or foreign matter can also clog the anal glands and cause an abscess to form.