Possible causes of skin discoloration are sun exposure, certain medications such as estrogen and other hormones, genetics and other factors. Usually brown spots are caused by a higher number of pigment cells located within the melanocytes. The principle of laser spot removal is through selective photothermal principle, the light of different wavelengths is absorbed by the corresponding pigment, the pigment particles absorb the high energy of laser in an instant and swell and rupture rapidly, forming smaller fragments, which are cleared by phagocytes in the body in the subsequent inflammation reaction, thus achieving the purpose of lightening the pigmentation. At the same time, the photothermal effect of laser can activate skin fibroblasts, increase collagen expression, produce molecular structure change of dermal collagen fibers and elastic fibers, increase their number, rearrange them, and restore skin elasticity, thus achieving the effect of reducing wrinkles, shrinking pores, and making them tighter and more elastic, so the effect of laser spot removal is very good. Advantages of laser blemish removal: It is a relatively fast treatment method and no anesthesia is needed. Usually 3-5 treatments (the number of treatments varies according to the depth of the pigmentation, and the number of treatments will be more if the pigmentation is deeper). The time required for one treatment is about 15-20 minutes. In addition to spot reduction, the skin will become delicate and firm due to the thermal effect of the laser. Disadvantages of laser spot removal: Since various treatment equipments are expensive, the treatment cost will be higher if different laser treatment methods are chosen according to different situations. If you don’t do enough treatment, sun protection and avoidance, the pigmentation may be more serious. To sum up, laser blemish removal is effective but expensive. Following the medical prescription treatment helps to achieve the purpose of blemish removal.