Inflammation of the fistula is usually due to bacterial infection, decaying material, and secretions that do not drain the fistula in a timely manner, such as an infection of the preauricular fistula. If the preauricular fistula is inflamed or infected, it should be treated promptly with anti-inflammatory medications, usually penicillin and cephalosporins. If the fistula site is obviously red and swollen, or even forms pus and fluctuates, you should go to the ENT department of a regular hospital in time. The first step is to incise the abscess, drain the pus and disinfect it thoroughly with iodophor, change the medication regularly, and place drainage strips in the surgical cavity to promote clean drainage of the pus. After the acute infection has been controlled, surgery to completely remove the fistula is then considered for radical treatment.