There is no such thing as the fastest way to get rid of knife scars, as individual differences are huge and the speed of elimination of scar growth varies from person to person. There are three common clinical scar treatment methods, namely medication, physical therapy and surgery. 1. Medication includes both topical and local injection. Topical ointment can choose onion extract preparation or silicone preparation, and more serious scar growth can choose local injection of trimethoprim or 5-fluorouracil for treatment. 2. Physical therapy includes laser therapy, pressure therapy, cryotherapy and radiation therapy. Among them, X-ray radiation therapy has a more obvious effect in the early prevention of scars and combined treatment. 3. There are three main types of surgical treatments: surgical excision, keloid contracture release and skin grafting. Surgery is usually applied to the more serious hyperplastic scars that have not been significantly improved by other conservative treatments. If scar hyperplasia occurs, please consult a doctor in time and choose the appropriate treatment plan under the guidance of the doctor.