Acne scars, the signs left behind after facial acne has healed, may be hyperpigmentation, atrophic scarring, or hyperplastic scarring. They can be treated with topical medications, physical therapy, and surgery if necessary. 1. Hyperpigmentation: Acne belongs to the chronic inflammation of sebaceous glands, which leaves post-inflammatory hyperpigmentation after healing, resulting in localized reddish and yellowish-brown patches. Vitamin C and hydroquinone cream can be given to apply topically, which can help to lighten the melanin; it can also be combined with phototherapy such as picoseconds to improve. 2. Sunken scar: Sunken scar is mostly seen on the side cheeks, mainly manifested as irregular pits on the face. It can be stimulated by carbon dioxide fractional laser, 2940mm erbium laser and other photoelectric treatments to regenerate and rearrange the local collagen tissue, and can also be injected locally with collagen and autologous fat to fill in to improve the appearance of the depression. 3. Proliferative scar: Proliferative scar, i.e. acne lesions, may lead to localized red, proliferative tissue mass. The scar tissue can be atrophied by local injection of glucocorticoid drugs. Surgical excision or postoperative radiation therapy can also be used to achieve better results. To summarize, there are more types of scarring formed by acne, and different types of scarring are treated in different ways. It is recommended to go to the plastic surgery department of a regular hospital for consultation, so that a specialized doctor will take into account the actual situation of the patient and formulate a suitable treatment plan.