In the first change of medication after surgery, if the wound surface is red, there is no obvious hard nodules, oozing, pain and no increase in body temperature, etc. is normal, pay attention to observe the redness of the wound when changing the medication later. If the redness of the wound recedes or the scope is reduced, it is fine. If the redness of the wound increases or there is ooze or pus flowing out from the inside of the wound, it means that the wound has become infected. If the wound becomes infected, the sutures on the surface of the wound should be removed in time to drain the exudate and pus inside the wound to the outside, then fill the wound with iodophor gauze or ezacridine gauze to drain the wound smoothly, and change the medication on the wound every day afterwards.