An anal fistula small channel with its internal opening in the anal canal and its external opening in the skin near the anus . 

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Causes includes 

•  An infection near the anus causing abscess in the nearby tissue

• Crohn’s disease

•  Infections from Tuberculosis (TB) 

 

Sign & symptoms include

• External opening on perianal region  

• Pus or blood discharge 

• Swelling 

• Pain 

• Skin irritation & redness around anus 

• Bowel incontinence and constant pain that may be worse when you sit down, move around 

• Have a bowel movement or cough etc.

 

Treatment includes  open / laser  fistulectomy .

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