Acne scars are scars that are left behind when acne is not treated in a timely manner or when treatment is incomplete. Acne is commonly known as “acne” or “acne folliculitis” and is a multifactorial disease that occurs during adolescence, when sebum production and excretion increase due to increased androgens in the body. In this nutrient-rich and relatively oxygen-deprived state, Propionibacterium acnes multiplies actively, destroying the follicle wall and glands, leading to local inflammation, septicemia and necrosis, and eventually leaving scars. Acne scars are a problem that many acne patients feel anxious about. The more severe the inflammatory reaction during an acne attack, the more severe the destruction of skin tissue: the deeper the inflammatory reaction, the deeper the destruction of skin tissue, and the more severe the acne scars that may remain in the future. Therefore, acne and acne scars are the two main aspects that need to be taken into account when treating acne. What can be done to remove the existing acne scars? First of all, we need to know the types of acne scars, acne scars are divided into two categories: depressed scars and hyperplastic scars. The red spots (caused by the inflammatory reaction of acne and the expansion of blood vessels) and black spots (pigmentation after inflammation) that we often see after the healing of acne, commonly known as “acne marks”, will naturally fade after a long time, about six months on average, so they are generally temporary pseudo-scars and not real acne scars. You can accelerate the disappearance of the discoloration by using topical vitamin A acid, fruit acid, or receiving fruit acid peel, dye laser, intense pulse light, or L-vitamin C introduction. True acne scars do not disappear on their own and need to be treated by a dermatologist before they will improve or disappear. Depressed scars are more common and are caused by the inflammatory reaction of acne that injures the dermis, resulting in the collapse of the dermis or tissue loss and leaving a depression. This kind of scars once produced will not disappear automatically, the current treatment methods available are: 1, fruit acid peeling: exfoliate the keratin layer, promote the aging keratin layer off, accelerate the renewal rate of keratinocytes and a few upper epidermal cells, promote the growth of elastic fibers in the dermis, for shallow acne scars have a better effect. 2.Filling method: injecting implants, such as collagen, to augment the depressed part. 3.Intense pulse light: stimulates fibroblast and collagen proliferation to thicken the dermis, which is effective for red acne scars and newly generated shallow depressed scars. 4, fractional laser: is currently the most advanced, the best treatment effect of acne depressed scars, fractional laser, also known as “beam laser”, “pixel laser”, are an image of the title. In essence, each pulsed laser is divided into hundreds of micro-laser pulses, each micro-laser spot is only 75-100μm, when these tiny laser beams act on the skin surface, those densely distributed dots look like imaging “pixels”, hence the name pixel laser. The fractional laser uniformly punches microscopic holes in the skin, which in turn causes a series of biochemical reactions in the skin, resulting in the removal of scarring, pigmentation, skin tightening and rejuvenation. Since the fractional laser treatment will only cover part of the skin tissue, the newly punched holes will not overlap each other, and the normal skin between the holes is preserved, which acts as a bridge and facilitates rapid skin recovery. Patients can return to normal life after four to five days. The treatment itself is safe and can be performed on any part of the body. Hyperplastic scars, commonly referred to as “crab feet”, are usually congenital, difficult to treat, and prone to recurrence. It is an overly hypertrophic scar that leaves a visible red bump on the acne site with a red and swollen appearance, which can increase in size due to scratching or external stimulation. Currently available treatment methods: 1.Local subcutaneous injection: the commonly used drugs are steroids, which can gradually soften and flatten the scars after several local injections. 2.Laser treatment: The commonly used one is dye laser. The hemoglobin in the scar can absorb the laser, which specifically acts on the microvessels and damages the blood vessels in the scar, which can make the scar improve significantly. If acne is not treated in a timely manner in the early stage, it will leave a crater-like scar on the face, which will seriously affect the beauty. If the scar has already formed, you can consult a professional laser aesthetic doctor to develop the best treatment plan to restore a beautiful face as soon as possible .