There are two possibilities for anal boils: first, they are caused by purulent infection of the hair follicles around the anus, and the route of infection is through skin invasion. The second is the perianal abscess, the perianal abscess is caused by the infection of the anal gland in the rectum, so the perianal abscess in the rectum memory within the mouth, the clinical treatment is based on surgery, you can perform abscess incision and drainage, and then perform anal fistula surgery after the formation of the second phase, you can also perform perianal abscess one-time radical surgery, although the surgical trauma is relatively large, but can avoid two surgeries.