Acne, commonly known as pimples, is very common among young men and women in modern times. And the marks left by acne can form a variety of scars. Some appear as hyperpigmentation, some as depressed scars, and some as protruding hyperplastic scars. Among them, depressed scars are the most common and the most difficult to treat. In addition, some trauma scars also show the end result of depressions, which can be very detrimental to the appearance on the head and face. Severe acne can lead to bacterial infection and pus, and because the layers of skin invaded are deeper, the final development often ends up with depressed scars. If it is more intensive, that one small depression will make the smooth skin look uneven and difficult to cover up with makeup. To date, the treatment of depressed scars remains a challenge. However, with consistent long-term treatment, a cure is not impossible. In my opinion, the method of microdermabrasion is the more effective treatment at present after considering a combination of factors. The principle of microdermabrasion is to produce thousands of tiny aluminum trioxide polycrystals (referred to as microdermabrasion) instantaneously, which are guided by a vacuum sealed system and hit the surface of skin scars at high speed to remove the epidermal stratum corneum, improve tissue regeneration and regenerate tissue. With the correct operation, polishing to the bottom of the depressed scars, the tissue will gradually repair and grow, and the depressions will become shallow until they disappear completely. Since the microcrystalline particles are small and uniform, when abrading with scars and other tissues, their surfaces bond with the abraded tissue debris and tissue fluid, blunting the original angles of the crystals, so the polishing will not be too deep, easy to control and more effective. And after the keratin layer on the scar surface is removed, the barrier function of the skin can be temporarily opened for 6 hours, and at this time, some products that promote tissue growth are applied in time and absorbed especially completely, so that the maximum effect can be achieved. And depending on the renewal time of the skin, such a treatment also needs to be repeated every three weeks for gradual improvement.