A large piece of skin on the knee can be cleared in time after the injury, the use of swelling and pain medication, life to avoid contamination of the wound, strengthen nutrition and other methods to help patients recover. 1. Cleansing: when the wound is contaminated, you can use hydrogen peroxide or saline to flush the wound, trim the necrotic tissue, and disinfect the wound with iodine for bandaging. 2. Anti-swelling and pain-relieving drugs: anti-swelling drugs such as Meiziling, anti-inflammatory and pain-relieving drugs such as ibuprofen, these drugs can help patients to relieve pain, and if necessary, epidermal growth factor gel and healing new liquid can be used to help the wound healing. 3. Daily treatment: avoid contamination of the wound in life, strengthen nutrition, regular disinfection, change the medicine, to ensure that the wound will not be infected. There is no special way to help patients recover the fastest, we suggest to go to the hospital in time, under the guidance of the doctor to standardize the treatment. Drugs please use under the guidance of a doctor.