Yellow water flowing from knee abrasion needs to be treated according to the different conditions of the patient. 1. If the patient’s knee abrasion is relatively light, the skin breaks relatively shallow, you need to first debride the wound, clean off the surface of the wound dirt, etc., and then carry out a little disinfection and then bandage, and change the medicine regularly. The wound should be careful not to get wet, avoid strenuous exercise. 2. If the patient’s knee abrasion is more serious, the skin breaks deeper, the subcutaneous fat layer has been exposed, then you need to debride the wound, then use petroleum jelly gauze to cover the wound, the most outside with a sterile dressing for a while to bandage, but also regularly change the medicine, until the wound is healed. After the injury are required to inject tetanus antitoxin to prevent tetanus, and take amoxicillin, cefaclor and other antibiotics to prevent infection. The yellow water flowing from the patient’s knee abrasion is oozing intertissue fluid, not all infection. If the patient’s condition is more serious, he or she should still go to the hospital and ask the doctor for treatment.