The process of changing a dressing for a buttock injury can be roughly divided into 4 steps: removing the old dressing, disinfecting the skin, cleaning the wound, and covering the dressing to hold it in place. The details are as follows: 1. Remove the old dressing: the outer layer of the dressing by hand, the inner layer of the dressing with sterile toothless tweezers to uncover, into the curved disk, move gently, such as adhesion with the skin, can be dipped into saline wet and then carefully, gently remove the dressing. 2. Disinfect the skin: use iodine or povidone-iodine cotton balls to disinfect the skin around the wound, infected wounds are disinfected from the outside to the center, and sutured wounds are disinfected from the center to the outside, generally 15cm in diameter and disinfected 3-4 times. 3. Clean the wound: Observe the wound for redness, swelling, pus, granulation tissue growth, etc. If there is internal exudate, dip a cotton ball in saline and gently dip it into the exudate, and dry it with a dry cotton ball. If the wound needs to be drained, place gauze strips or latex tubes according to the position and location. If there is pus in the wound, clean the pus, or leave a drainage strip or tube. 4. Cover dressing fixation: finally cover the wound with sterile gauze and fix it with adhesive tape, with the direction of the adhesive tape perpendicular to the long axis of the body; or fix it with bandage wrapping. Before the wound is completely recovered, pay attention to a light diet, quit smoking and drinking, avoid getting water on the wound, and don’t pull the skin at the wound to avoid affecting the recovery.