A scraped knee usually heals on its own in about 1 week, but if infection occurs, it will take 2~3 weeks or even longer. If it is only a mild fall, with less bleeding after the injury, and at the same time cleaning the wound in time and sterilizing the wound with iodine povidone, the wound will be able to heal by itself in about 1 week, and the non-bleeding wound may be scabbed or healed in 2~3 days. However, if the wound is not disinfected in time after abrasion and becomes infected or pus-filled, the wound will first need anti-infection treatment and antibiotics such as cephalosporins to control the infection, and then the wound will gradually scab over, which may take 2-3 weeks, and some people with coagulation disorders and other underlying diseases may need a longer period of time.