Fractional laser is a new cosmetic technology that is very effective in treating acne and helping people to solve their acne problems. When a child enters puberty, the secretion function of the sebaceous glands is stimulated due to the high demand of growth hormones as well as sex hormones. A large amount of excess oil rushes to the surface of the skin, some of which reaches the surface smoothly, while others are blocked by “traffic” and stop halfway. These blocked oils can cause pimples, papules and pustules on the face, chest and back, which are itchy, painful, cosmetically unpleasant, and lingering, long-lasting and recurring. The damage to the skin is deep to the dermis or a large epidermal defect, the epidermis in the area cannot be regenerated and is replaced by collagen fibers and proliferating blood vessels of the dermis, so that scars appear. Fractional laser is ideal for scar treatment. It works by using a high intensity beam of light so that specific wavelengths are absorbed by pigments or tissues in the skin, and the laser breaks down the pigmented material deposited in the skin in a nanometer’s time to be absorbed by the body and promote collagen growth to treat scarring, remove spots, and improve skin quality. In addition to treating scarring, the beam laser also has a positive effect on cosmetic skin problems such as rough skin, enlarged pores, skin discoloration, and fine wrinkles, making the skin delicate and smooth.