As technology advances, the use of lasers for medical treatment of diseases is becoming more and more common, and scars cannot be treated without various types of lasers. Can lasers remove scars? What are the most common lasers used to treat scars? In clinical practice, we choose different lasers according to the different conditions of scars: i. Newly formed scars For newly formed scars, pulsed dye laser and intense pulsed light can be used to inhibit the blood vessels of the scar and perform early laser intervention to occlude its nutrient supply, so that the scar can mature and stabilize more rapidly. The use of fractional laser can promote regenerative collagen remodeling in the scar tissue, allowing the scars to progress in a positive direction. II. Scars and hyperplastic scars Hyperplastic scars or scars, depending on their condition, choose to use a variety of methods such as reddening laser, exfoliative laser, or even with radiotherapy and drug introduction to inhibit their growth. 3. Old scars Old scars, such as accidental injuries in childhood, become large, grayish-white, relatively flat and soft scars with the passage of time. Although it does not hurt or itch, it differs greatly from the surrounding normal skin, has color difference, the surface is not smooth, does not grow sweat hair, and affects the beauty. For these types of scars, we can use fractional lasers, ion beam, bait lasers and other ablative lasers to improve the flatness as well as the discoloration of old scars. Most scars can be treated or improved by laser, but some scars older than one year, especially tattoos, are often difficult to remove by laser means. So this kind of scars that are not suitable for laser treatment usually use surgical excision to achieve the purpose of removal. After excision, the appearance of the affected area can be greatly improved with super reduction fine suturing and high patient satisfaction.