Many patients with late trauma change their own medication at home. The recommended medication change process is now introduced to all patients or their families to facilitate correct operation: 1. Frequency of medication change Select the appropriate frequency of medication change according to the type of trauma and whether it is infected. Generally speaking, it is once a day, i.e. after bathing. If it is winter and the trauma is dry, it can be done once every 2-3 days. Conversely, if there is a lot of oozing or if infection occurs, it can be twice a day. 2.Preparation materials Besides disinfectant water and medicine, some materials are needed for the operation of dressing change Essential: disposable dressing bowl, disposable forceps, cotton balls, gauze, adhesive tape, bandage Optional: sterile gloves, dressing 3.Medication change process 1) Wash the wound with warm water (tap water), that is, take a bath. Clean around the wound, the wound must also be gently rubbed by hand, which is very important, do not be afraid, there will be no pain, even if there is a small bleeding does not matter. The granulation tissue of the wound must be rubbed with the hands in order to wash the wound thoroughly. The area around the wound can be cleaned with body wash, don’t worry about the body wash flowing into the wound and don’t worry about infection, the wound is much dirtier than your hands. 2) Wet gauze with antiseptic (chlorhexidine, iodophor, Plantron, Neuschuafil, Huihan Shutai or Dexion) and apply wet to the wound for about 5-10 minutes. This will promote the flattening of the edematous granulation and also drainage of the deep bacteria. 3) Wash the antiseptic off, as some residues of antiseptic may interfere with healing. 4)Apply topical growth factor (Fuzifu) 5)Apply topical gel medication (Plantron, Ansul) + silver sulfadiazine or debridement cream, apply on gauze and then cover the wound, be careful not to apply too much, the size of the wound can be. 6) Apply gauze, oil gauze or new foam dressing externally, please cover with at least 8 layers of gauze. 7) Simple dressing and proper fixation 4. Precautions 1) Sulfasalazine cream feels like pus after application, but in fact it is not pus, which can be identified from the patient’s subjective pain and improvement of redness and swelling around the trauma. 2) If the trauma is on the extremities, please elevate the affected extremities and avoid movement and weight bearing. If the pressure sore is in the sacrococcygeal region, please prevent pressure on the trauma and enhance turning.