The knee broke the skin should do the following treatment: first, you can locally apply iodophor, use iodine for disinfection and then alcohol deiodination, you can also use topical erythromycin ointment, mupirocin ointment, etc. for anti-inflammatory. Second, the injured place as far as possible do not get wet, make it as far as possible after the natural crust until the wound healing. Third, the intake of nutritious substances to promote the healing of the wound, such as vitamin and fiber-rich foods, such as apples, kiwi, duck pears, spinach, cabbage, lettuce, etc., but also appropriate intake of high quality protein rich in low fat and low cholesterol content, such as fresh fish and fresh shrimp, etc. Fourth, if time and economy allow, you can apply topical Chinese medicine or physical therapy to promote the healing of the wound. Fifth, patients also need to minimize activities so that the scabs do not fall off, which can also promote local healing.