Keloids are formed by abnormal growth of collagen fibers after injury or irritation; they are benign tumors of the skin that may only atrophy and not disappear. Keloids are caused by abnormal growth of collagen fibers due to irritation, similar to the principle of tumors, and a very small portion of them will form atrophic keloids due to removal of the original trigger, but they will not disappear on their own. On the basis of surgical excision, radiotherapy should be used to inhibit the proliferation of collagen fibers so as to inhibit the growth, and glucocorticosteroids such as dexamethasone injection can also be used to treat the scar. Keloids will not disappear on their own, once found, should consult a doctor in time, under the guidance of the physician for treatment. Please strictly follow the doctor’s instructions, do not self-medication.