Scars on the knee are usually removed clinically with the help of medication, surgery, and physical therapy, and larger, deeper, and more complex scars can be improved and may be difficult to remove completely. Scar is due to skin damage to the dermis, the product of excessive repair, manifested in the trauma of the skin appeared higher than the skin surface of the red pimples, plaques or swellings. 1. Drug treatment: local topical cumexoside cream gel, polysulfonic acid mucopolysaccharide ointment, etc., which has a certain inhibitory effect on scars, but also local injection of glucocorticoids, such as tretinoin injection, compound betamethasone injection, etc., which can inhibit the local excess collagen fibers, thus achieving the role of inhibiting scars. All the above drugs should be used according to the doctor’s prescription, avoid self-medication. 2. Surgery: Surgery is the removal of scar tissue by excision, usually supplemented by radiotherapy to prevent recurrence of scarring. 3. Physical therapy: CO2 laser can be used to promote collagen repair and drug penetration. Scars on the knee suggest that patients go to a regular hospital, under the guidance of a professional doctor to choose the appropriate treatment.