Scars are the common name for scarring. Lasers are effective for the treatment of acne scarring, as they are generally less invasive to the patient and can reach the lesion directly, effectively fading the acne scarring. There are more types of lasers, among which fractional lasers are divided into non-ablative and ablative fractional lasers. Non-ablative lasers can be used to treat minor acne scars, while ablative lasers such as erbium lasers can be used to treat severe acne scars. Acne scarring can be divided into depressed and hyperplastic scarring, and depressed scarring is mainly treated by laser. Currently, fractional lasers are most commonly used in clinical practice and have good results for different types of depressed scars, including roller type, van type and ice pick type acne scars. If the acne scar depressions are deep, 5-6 or more treatments are often required. Hyperplastic scars can be softened and flattened with the use of hormonal medication and localized closure, or with laser treatment. After the laser treatment, it is important not to get wet, because the CO2 laser forms dotted channels in the local skin, which can easily lead to bacterial infection after contact with water. At the same time, attention should be paid to sun protection, because it can cause some damage to the local area, and pigmentation can occur after sun exposure. At the same time, you should avoid eating a spicy and stimulating diet to avoid acne recurrence.