Years of underarm scars, known as old scars, can be treated with medication, photoelectricity and surgery to improve their appearance. 1. Photoelectricity treatment: Laser repair to the underarm old scar is less painful and quicker recovery. Laser is through a specific wavelength laser photothermal effect, the scar local pigment particles decomposition, at the same time make the scar collagen fibers as well as elastic fibers rearranged to improve the appearance of the scar. 2. Surgery: If the underarm scar is more serious and hyperplasia occurs, you can go to the plastic surgery department of a regular tertiary hospital to get a clear diagnosis, and then you can take the surgical plastic surgery method for treatment, which can improve the symptoms. 3. Medication: At present, for old hyperplastic scars, hormonal drugs such as Triamcinolone acetonide can be injected locally to soften the scar and improve its appearance. Patients who are willing to treat underarm scarring should choose a regular tertiary hospital, complete the relevant examinations, and then choose the appropriate treatment under the guidance of specialists for standardized treatment, in order to avoid adverse consequences.