Microdermabrasion, derived from the fractional photothermolysis theory of Harvard medical expert roxAnderson, is a minimally invasive laser technology that emits a hair-thin matrix of laser light that can penetrate directly into the dermis, instantly vaporizing scarred or wrinkled tissue and sending a strong signal for collagen synthesis, thereby initiating a series of skin reactions such as tissue repair and collagen rearrangement. The epidermis heals within 8 hours, the skin starts to return to its normal appearance in about 6 days after 3D, and the internal collagen regeneration can take up to 6 months or even 6 years. Therefore, the introduction of microfractional fractional laser has set the gold standard for ultra-pulsed CO2 laser acne scar treatment. Because the CO2 laser used in microdermabrasion is a high-energy ultra-pulsed peeling laser, the absorption rate of water in human skin is between that of the erbium laser and the near-infrared laser, so its penetration depth is deeper than that of the erbium laser but shallower than that of the near-infrared laser. It can vaporize the pigment in the epidermis and achieve the whitening effect. At the same time, its heat transmission can reach the superficial dermis, which can tighten the skin immediately, and the heat can stimulate collagen growth in the dermis, resulting in long-term improvement of skin pigmentation and structure. In addition, fractional microdermabrasion offers a wide variety of spot shapes, sizes, and densities, so it has a wide range of indications, including the following: 1) acne scarring 2) superficial facial redundancy 3) sweat duct tumors 4) skin texture disorders 5) solar keratosis 6) lid warts 7) other types of scarring Technical advantages of fractional microdermabrasion: The fractional laser produces exfoliative bands, and the horizontal and vertical coagulation bands reactively stimulate tissue regeneration, while the normal skin between the exfoliative bands is rejuvenated. The normal skin bridges between the exfoliated bands help accelerate skin reconstruction. This improves the effectiveness of the treatment while significantly reducing the recovery period. 1, fast skin repair, long lasting effect 2, high energy, short pulse width precision control epidermal and dermal dual action 3, penetrate the dermis, start collagen repair mechanism 4, epidermal action, immediate skin tightening effect