Scars left by acne can generally be divided into two types-acne marks and acne scars: Acne marks (red and black marks): most of these types of marks will recover on their own, usually in about three months, and some people take a year or more. Acne scars (hollows, bumps): their recovery period may take 1-2 years, and only a few of these scars can recover completely on their own. Acne scars must be treated on a case-by-case basis, and should not be treated in an emergency. When the inflammation of acne reaches deep into the dermis or a large epidermal defect, the epidermis in the area cannot be regenerated and will be replaced by dermal fibroblasts, collagen and proliferating blood vessels, thus resulting in a scar. There are two types of scars: depressed and proliferative scars. Once formed, these two types of scars will not disappear automatically and need to be treated by a professional dermatologist in a timely manner. Remember to use your hands to squeeze the acne, squeezing improperly and destroying the sebum layer will easily leave scars. For different cases of depressed and hollow scars, treatments such as red light repair, microdermabrasion, photorejuvenation and fractional laser can be used, together with growth factors to promote collagen growth. Photorejuvenation is treated about once a month, 3 times per session. Usually after one session, the skin will adjust to a better condition, but more serious cases may require more than one session of treatment. Microdermabrasion is very demanding for the operator of the apparatus, especially prone to some adverse reactions, and must be performed without acne. The disadvantage is that it is slightly painful and may cause hyperpigmentation, so sun protection and maintenance after microdermabrasion are very important. Hyperplastic scars can be treated with hormone local closure, liquid nitrogen freezing, etc., and then with fractional laser treatment according to the recovery situation, good results can be achieved. General removal of red marks and black marks can also choose to do related professional care. Red marks can choose moisturizing and restorative skin care products, paying special attention to sun protection to prevent pigmentation. Melanin can use whitening and sunscreen products. Going to a regular hospital’s medical aesthetic department for red mark repair and pigmentation lightening treatment will significantly shorten the duration of red marks and melanin left behind. In addition, many acne treatments result in secondary skin sensitivity, such as red, shiny, dry and flaky skin. Moisturizing is especially important at this time. Choose skin care products that are gentle and non-irritating, with soothing, hydrating and restorative medical skin care products, and stop using drugs and cosmetics that contain keratin peeling. Some acne marks can be prevented. Most acne is based on the original blackheads and whiteheads that are infected with acne rods and produce inflammation. Go to a regular medical aesthetic center to remove blackheads and whiteheads when they are still inflamed or use acne products to eliminate them as soon as possible when they first sprout, so that they do not produce visible acne marks due to the acne becoming larger. All in all, hydration and sun protection is an essential daily homework to get rid of acne marks and is a prerequisite for repair, which can have a half-hearted effect. In life, you must develop good habits, pay attention to personal cleanliness, use mild cleansing products, avoid using alkaline soap cleaning, keep your face and hands clean. Diet should eat more vegetables and fruits; less chili, sugar-rich and high-fat food to avoid stimulating sebum secretion. Live a regular life, stay optimistic and do not stay up late to prevent recurrence.