After the trauma stitches for drug exchange, the following conditions are required: 1, need to be in a relatively sterile environment for the drug change operation, the hospital are chosen in the drug change room for drug change. If the number of bacteria in the environment exceeds the standard, it may cause wound infection in the process of changing medication, resulting in wound ooze, pus, etc. 2. In the process of changing medication, you need to use a medication bowl or sterile medication change kit, etc., because there is sterile gauze in the sterile medication change bowl or medication change kit, as well as medication change forceps, iodophor cotton balls, etc. The doctor will help you to change the medication in the sterile dressing room. 3, you need to observe the changes in the wound, whether there is redness, swelling, oozing and so on.