For various reasons, many problems in the body need to be solved by surgery, such as thyroid tumors, breast lumps, facial trauma …… the solution to these problems require surgery, and after surgery will leave scar, these scars can be repaired by plastic surgery, but after surgery will still leave or obvious or slim scar, this time the surgery has reached the There is no room for improvement. Scarring is the memory of a trauma to beautiful skin, how can this unpleasant memory be eliminated? The advent of new laser technologies such as fractional CO2 laser and plasma plasma offers the opportunity to further reshape the scar of the incision. Although the mechanism of fractional laser and plasma is different, their action on the tissue is in fractional mode, which reduces the damage to zero and allows for fast recovery, greatly reducing the risk of scarring, discoloration or depigmentation associated with traditional treatments. There are three main problems with scarring: 1. flatness: unevenness, prominence, and lower than the skin surface, which makes the skin look uneven and delicate; 2. color: most scarring is red in the proliferation phase, white in the maturation phase, and brown in a few pigmentation remnants, which contrasts with the surrounding skin; 3. texture: scarring is generally tougher in the early stage and softer with time. The texture of the scar is usually softer in the early stage, and becomes softer with time, but the feeling of touching it is still different from the surrounding area. Laser treatment for keloid scars is aimed at these three aspects: 1. Firstly, additive and subtractive treatment for flatness: depressed keloid scars mostly reach stability after 3 to 6 months and will not grow flat on their own. To restart the growth of the dermis, some stimulation is needed, which requires laser energy to achieve (Micro-needling System MTS, which also uses this principle, but the effect is inferior to laser due to the lack of thermal stimulation). The laser stimulates the collagen to grow and rearrange, resulting in an improved flatness of the scar. This is an addition to laser treatment. Also, for vertical edges or hyperplastic nodules between the normal skin and the depressions, laser abrasion in ultra-pulse or continuous mode can be used to remove the visual “shadow” formed by the edges of the depressions and to transform the “bowl” into a “plate The effect of “bowl” to “plate” or “peak” to “plain” greatly improves the flatness and makes the light projected to the skin change from diffuse to reflective, thus making the scar appear smooth. This is the “subtraction” of laser treatment. 2. Secondly, skin resurfacing treatment for color: Fractional CO2 laser and plasma are both exfoliative treatments, in short, they will scab, which will initiate the re-epithelialization of the skin, which is equivalent to the skin in the treatment area growing again, during the growth process the pigment cells and pigments in the basal layer of the epidermis will be rearranged, so that the color will be greatly improved. 3. Balancing collagen secretion and alignment to improve Scar texture: Fractional CO2 laser and plasma can regulate the proliferation and apoptosis of fibroblasts, the synthesis and degradation of collagen, and improve the metabolism, so that the texture of the scar can be improved. Before the fractional mode laser, abrasion (dermabrasion) was generally used, which mainly re-epithelializes and stimulates the dermis, but is slightly less effective due to the lack of thermal stimulation. Case Before treatment 1 time laser treatment 2 times laser treatment