Surgery for perianal abscess is generally as follows: 1. incision and drainage to control the infection, followed by anal fistula surgery after three months; 2. one-time treatment: the infected internal opening is found while the abscess is treated and it is treated together. If the abscess is shallow, the infected site can be opened directly, and then the medicine can be changed to make it heal. The inner mouth can also be treated by hanging a solid line or floating line. Hanging a solid line, i.e., a rubber band and other tense material, can make chronic cuts to the wound, and then open it after a week or so and change the medicine; hanging a floating line, i.e., hanging a comfortable material at the wound to play the role of drainage, and the line can be removed after six months when the wound heals better.