Knocked knee skin needs different treatments according to the depth of the wound and the size of the wound, including wound cleaning, wound disinfection, suturing and bandaging. 1. If the knee is broken on the surface of the skin, relatively shallow, and the scope of the wound is small, you can first rinse the wound surface with water or saline 2-3 times, then disinfect the wound with iodine povidone by applying it from the inside out, and repeat the disinfection three times, and then cover the wound with a clean gauze or put on a band-aid to bandage it. Keep the wound dry and avoid contact with water. 2. If the wound is deep and extensive, you need to consult a doctor. Follow the doctor’s instructions for deeper debridement and sterilization or even suturing. 3. For larger and deeper skin wounds, it is recommended to clean the wound with saline or hydrogen peroxide to remove the dirt on the surface of the wound. Then disinfect the wound with iodophor and disinfect thoroughly. Clean the necrotic tissue on the wound surface and suture the wound. After the suture is completed, you need to follow up regularly in the hospital, according to the healing of the wound to determine the time to remove the stitches. Avoid contact with water to prevent infection. Note: A skinned knee should be treated in time to avoid infection, and consult a doctor in time if you feel unwell.