Picosecond is to use the ultra-fast speed of picosecond laser to break melanin particles into powder, which is metabolized by the body to achieve the effect of spot removal in a gentle way without rebound. In addition, because the treatment time is picosecond level, which is 1000 times faster than traditional laser instruments, and at the same time, it only targets melanin, and the treatment is already over before it has time to destroy the surrounding skin, so there will not be any side effects. There is usually no obvious pain during picosecond treatment, but some beauty lovers will have the phenomenon of anti-darkness, which is normal and may be related to individual factors such as too much sun exposure and too dark skin tone after treatment, and the time is usually very short, mostly 3-7 days. The time is usually very short, mostly 3-7 days, because after the picosecond blasting melanin, then metabolized from the basal layer to the skin epidermis. The darker the skin is, the better the effect is, which means the pigment of the basal layer is extracted very thoroughly. However, one treatment of picosecond can not get rid of all the spots, at least 1 course of treatment should be done, that is, 3 treatments, once every 3 months. However, the specific number of treatments needs to be analyzed according to the specific situation of the candidate.