An anal fistula is a tunnel that develops from the inside of the anus to the skin outside. It usually starts near blocked or infected anal glands and forms an abscess (a pus-filled pocket). Pus and ...
Anal fistulas affect about 2 in 10,000 people yearly, with a higher prevalence in young men. Most fistulas form due to blocked anal glands, resulting in infection and abscess formation. Fistulas are ...