A bruised knee with pus, which is usually an infected wound, can be disinfected with iodophor. After several wipes of disinfection, furacilin solution or other anti-inflammatory solution can be given, soaked in 5-6 layers of sterile gauze and applied wet to the affected area. The duration of wet compresses is about 20 minutes each time, and can be applied 2-3 times a day. After the wet compress, if available, a semiconductor laser or red light can be given, followed by violet drops or ozone oil applied to the affected area. If there is no pus or other exudation, topical anti-inflammatory ointments such as erythromycin ointment and Bactrim ointment can be applied. However, if the wound is large, pus is large, and there is obvious redness and swelling around the wound, you need to go to the hospital for systematic treatment, and you may need to give oral and static antibiotics, but the specific situation and treatment need to be guided by the clinician.