Isotope treatment for keloid scars is very effective. Keloid scars are formed when skin overgrowth and abnormalities occur after a skin wound has healed or after a skin injury has healed for unknown reasons. Keloid scars not only affect the aesthetics of the patient’s body, with keloid scars appearing in more obvious areas, which look particularly unattractive, but also cause itching, pain and other uncomfortable symptoms of the skin. The majority of keloid scars will recur after simple surgical excision treatment. Patients with keloid scars are prone to reappear with new scars if there are incisions, and it is particularly annoying to have larger scars grow in the original area after surgery. Smaller keloids can be treated with radioisotopes, such as strontium 90 or phosphorus 32, which can be applied directly. Larger, thicker keloids can be treated with radioisotopes applied after surgical excision. The treatment will be given after the wound is removed, and the cure rate can be more than 80%. The efficacy is very reliable and has become a routine and effective treatment for keloid scars.