And then what? After acne, many of us have left ugly acne marks on our faces, which makes us feel quite embarrassed, then? Next, we invite experts from Beijing Zhongguancun Plastic Surgery Hospital to introduce the relevant contents. To understand the problem, let's first understand why we leave ugly acne marks on our faces. According to relevant experts, the reason why the skin will leave scars is because the dermis is damaged. If it is only epidermal damage, there will be no scars, even if some traces are temporary. If the acne on the face is not infected, then the acne will not leave a dent after it is cured; If it is an inflamed acne, as long as the inflammation subsides in the early stage, it will not leave a depression, but it may leave a mark, which is pigmentation after inflammation. Generally speaking, it will gradually recede after three months to a year or so. There are two reasons why acne has left a depression. One is acne infection, with abscesses and pustules. In order to discharge pus, or the pustule breaks and hurts the dermis, it will definitely leave scars; Another possibility is that you belong to the scar constitution, and even a small wound may leave obvious scars. So what? So what? According to experts, laser is the best way to solve acne marks, and laser treatment of acne marks has always been a better choice. In recent years, with the introduction of alma laser, the treatment of acne marks has made new progress. Alma laser treatment of acne marks subverts the traditional laser treatment mode, and the effect is more obvious. Alma laser treatment of acne marks belongs to the "dot matrix laser" type. Each pulse laser is divided into nearly 100 micro-laser pulses, and each micro-laser spot is only 75- 100um. When these micro-laser beams act on the skin surface, they stimulate the growth of collagen and elastic fibers in the subcutaneous dermis. Fade scars and eliminate acne marks, so as to achieve the effect of laser treatment of acne marks.