The anal fistula will have pus and bleeding at the external opening after it breaks, and should be cleaned immediately with warm water or warm salt water, and then disinfected with iodophor, which can be covered with a Band-Aid or gauze. And you need to take oral antibiotics to treat the infection inside the wound, you can take oral cefixime, you can also take oral levofloxacin, ciprofloxacin, etc., and also need to go to the hospital for examination and treatment. It is important to clarify whether the fistula is simple or complex. Most cases are simple fistulas, as they often have an internal and an external opening. In most cases, it is a simple fistula because it often has an internal and external opening. After 3-5 days of treatment, surgery is considered, usually a fistula excision or a fistula stitching procedure, depending on the height of the internal orifice. If the internal opening is resistant, the fistula can be removed; if the internal opening is high, the fistula can be threaded.