Persistent drainage · Usually follows an abscess
An anal fistula is an abnormal tunnel connecting the inside of the anal canal with the skin around it. It almost always appears after an abscess, and unlike other anal conditions, it does not close on its own.
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The hallmark is drainage that never quite ends: pus, fluid or a little blood coming from a small opening in the skin near the anus, sometimes with an odour. It stains underwear and comes in waves — better for a few days, then back.
There may be pain and swelling when the tunnel blocks and material builds up, then sudden relief when it drains. That repeating pattern of «swells, drains, settles» strongly suggests a fistula.
Most arise from a previous perianal abscess: after drainage, a tract is left that does not heal. That is why a share of people who had an abscess later develop a fistula, even when the drainage was done correctly.
Some fistulas are associated with other conditions, such as inflammatory bowel disease. That changes the plan, and it is one reason the whole case needs assessing — not just the opening.
A fistula requires surgery. No medication closes the tract; antibiotics can control an added infection but do not resolve the fistula.
The technique depends on where the tract runs in relation to the sphincter, and that is what is studied before operating: simple fistulas can be laid open (fistulotomy), while more complex ones may need a seton or other techniques to protect continence.
That distinction matters more than the fistula itself: the goal is to close the tract without compromising bowel control.
No. The tract is lined and does not close by itself. Antibiotics can control an added infection and relieve symptoms for a time, but the fistula remains and the drainage returns.
It is common and often means a fistula was left behind. It is worth assessing: it does not mean the drainage was done badly, it is a known course after abscesses.
That is exactly the risk considered when choosing the technique, which is why it matters to know where the tract runs before operating. At the consultation you are told which technique applies to your case and why.
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