Knee abrasion pus, this is usually the wound is infected, you can use iodophor to disinfect the wound, after a few wipes to disinfect the wound, you can give furacillin drops or other anti-inflammatory drops, soaked in 5-6 layers of sterile gauze, and then wet compresses on the affected area. Wet compresses should be applied for about 20 minutes at a time, 2-3 times a day. After applying the wet compresses, if possible, you can also give semiconductor laser or red light irradiation treatment, and then give purple drops or ozone oil to apply to the affected area. If there is no pus or other oozing, anti-inflammatory ointment can be used externally, such as erythromycin ointment, Bactrim ointment and so on. However, if the wound is large, with more pus and obvious redness and swelling around the wound, it is necessary to go to the hospital for systematic diagnosis and treatment, and may need to give antibiotics orally and sedation, but the specific conditions and treatments need to be subject to the guidance of clinicians.