The white film that appears on the wound after the wound is broken may be caused by cellulose film and bacterial infection. 1. Cellulose film: After the patient’s wound is broken, due to the self-protection ability of human skin, cellulose will be exuded through the wound to form a cellulose film, which will block microorganisms such as bacteria and other microorganisms from invading the wound, and at the same time, it will help the wound to stay dry, and play a role in promoting the scabbing of the wound. 2. Bacterial infection: If the patient does not disinfect the wound in time after the wound appears, bacterial infection will lead to pus in the patient’s wound and pile up on the surface of the wound, so as to form a kind of white film, which will cause the wound to be inflamed, and symptoms such as redness, swelling and pain will appear. After knocking the skin patients should disinfect the wound in time to avoid wound infection and inflammation, so as not to delay the condition.