Laser is used to remove melanin by smashing melanin particles and accelerating melanin metabolism, etc. Attention to care after operation can help achieve better treatment results. Laser removes melanin, mainly through the selective photothermal effect of laser on the skin, different wavelengths of laser light will be irradiated to the epidermis and dermis, so that the laser selectively acts on the pigment particles, and then the melanin particles will be crushed, so that it can be better metabolized and discharged through the lymphatic tissues and the lymphatic circulation, which helps to remove the precipitation of melanin. After laser treatment, it is necessary to pay attention to strengthen the local skin care to achieve better clinical results, such as laser treatment may lead to local swelling, itching, at this time can be intermittent ice packs, avoid scratching, which can reduce the chance of local infection, hyperpigmentation, scarring and other complications; can be used in the collagen surface dressing, ice film care, pay attention to the skin hydration and moisturizing, and strict sunscreen and so on. It should be noted that patients are advised to go to regular hospitals and beauty institutions for laser treatment to avoid adverse reactions.