Pixel laser is a new aesthetic concept of laser medicine, which is a technology that transforms the traditional laser emission mode into a pixel mode (microporous mode). Why is it called pixel laser? In fact, it is a figurative term for a laser that divides each pulse into hundreds of micro-laser pulses, each micro-laser spot is only 75-100um, and when these tiny laser beams are applied to the skin surface, the densely distributed dots look like imaging “pixels”, hence the name pixel laser. The clinical mechanism of pixel laser is the theory of “micro-trauma repair”, that is, the skin tissue has the ability of self-repairing trauma, and when the skin is damaged by trauma, it can heal and repair itself, and when the trauma area is too large, the result of repair is scarring, and when the trauma is small, the skin can recover completely. Each tiny beam of the pixel laser is a tiny trauma to the tissue, which is enough to start the regenerative repair function of the tissue, stimulating the secretion and proliferation of collagen and elastic fibers in the dermis, or causing the surface micro-exfoliation effect, making the epidermis “taut”, reducing skin wrinkles, increasing skin elasticity, and achieving the “skin surface reconstruction” effect. “Therefore, the pixel laser is a new laser skin resurfacing model, which is clinically used for facial resurfacing, treatment of scars, acne scars, wrinkles, pigmentation, enlarged pores, rough skin, photoaging skin, etc. Because this technology is non-invasive or minimally invasive, and the recovery period after treatment is short, it is the most ideal and effective way to treat all kinds of scars. currently a more ideal and safe means of treating all types of scars. The commonly used pixel lasers are Er:YAG bait laser (2940nm, 1540nm), etc.