Self-healing time for knee abrasions depends on the extent of the abrasion, which may take 1-2 days for minor cases and 2-3 weeks for major cases. If the knee is only a minor skin abrasion, it will usually scab over and heal itself in 1-2 days; if it is a larger skin abrasion, it will usually heal itself in 5-7 days; if the wound is deep with light yellow exudate, it may take 1-2 weeks to recover; if it is an obvious deep wound that requires stitches, it may take 2-3 weeks to heal itself. Regardless of whether the wound is large or small, the patient should pay attention to the cleanliness of the wound and disinfect the treatment with iodophor or alcohol in a timely manner to prevent infection; if infection occurs, the time for self-healing recovery should be extended. If the wound is very deep or if infection occurs, promptly seek surgical attention to avoid aggravation of the condition. When the knee is bruised, patients should eat lightly, avoid spicy food, avoid alcohol, avoid secondary injuries caused by strenuous exercise to prevent aggravating the degree or area of the bruise, pay attention to wound cleaning and avoid infection.