Anal fistulas with multiple external openings are mostly dispersed on the left and right sides of the anus. Anal fistula is short for anorectal fistula, is the anal canal or rectum and perineal skin connected to the chronic, infected channel, is anorectal abscess broken or incision and drainage of the aftermath of the lesion, by the internal mouth, fistula, external mouth of the three parts of the composition. Anal fistula if only an external mouth is generally known as simple anal fistula; if there are more than one external mouth is generally known as complex anal fistula. Fistulas with multiple external orifices are mostly scattered on the left and right sides of the anus, forming multiple subcutaneous fistulas that can be touched as hard, string-like lumps. If you have an anal fistula, you need to go to the hospital as soon as possible, by the doctor according to the specific conditions, to develop individualized diagnosis and treatment plan, so as not to delay the condition.