A knee that still hurts after a fall and scabbing can be a normal sign of wound healing, or it can be caused by an infection or allergy at the wound site, for example. There are different ways to cope with different symptoms. Commonly used treatments are cleaning the wound, medication and so on. 1. Normal healing: keep the local skin dry and clean during the scabbing period, try to make the scab fall off naturally, don’t uncover it by hand to avoid destroying the collagen fibers that have been formed, which is not conducive to the healing of the wound and may cause secondary trauma. 2. Infection: after the knee breaks, the wound surface may heal, but the internal is not fully recovered, if the bacterial wound is susceptible to infection; there are foreign objects or necrotic tissue in the wound, it is also easy to induce infection. The wound may be red, swollen and painful after infection. If the wound is infected, the wound should be disinfected, foreign matter or necrotic tissue should be removed from the wound in time, and sterile dressings should be used. If necessary, follow the doctor’s instructions to use amoxicillin capsules or erythromycin dispersible tablets and other anti-infection. 3. Allergy: If the patient has a history of allergy, contact with allergens may cause redness, swelling and pain around the wound scab. May also be allergic to the wound dressing used to cause wound pain. This kind of patients can change the dressing, using sterile gauze local bandage. At the same time, the use of glycerine lotion or loratadine in the wound for anti-allergy treatment can help to relieve the redness, swelling and pain of the wound. If the symptoms of pain at the broken skin and crust of the knee do not improve for a long time, you should go to the hospital in time, under the guidance of the doctor’s treatment, to avoid delaying the condition.