Also known as the third type of surgery. Infection has occurred at the surgical site before surgery, such as peritonitis surgery caused by gastrointestinal perforation, strangulated hernia surgery, tuberculous empyema or sinus incision and suturing, surgery connected to the mouth and intestines, abscess and carbuncle incision surgery , Window drainage for purulent osteomyelitis, escharectomy for burn wounds, etc. Most of these surgical wounds heal in the second and third stages (two levels), and sometimes they can also heal in the first stage.

Also known as the third type of surgery. Infection has occurred at the surgical site before surgery, such as peritonitis surgery caused by gastrointestinal perforation, strangulated hernia surgery, tuberculous empyema or sinus incision and suturing, surgery connected to the mouth and intestines, abscess and carbuncle incision surgery , Window drainage for purulent osteomyelitis, escharectomy for burn wounds, etc. Most of these surgical wounds heal in the second and third stages (two levels), and sometimes they can also heal in the first stage.