Does the wound need dressing change?

General dressing needs: a sterile dressing bag (including dressing bowl, two tweezers and 2-3 gauze), iodine cotton balls, alcohol cotton balls, physiological saline cotton balls, medical adhesive tapes and bandages. When changing medicine, doctors need to wear hats and masks, and the dressing change is carried out in the dressing room. They don't have hospital conditions and sterile things at home, so it's easy to cause wound infection if they change them themselves. Moreover, if they are amateurs, they will be infected.