The picosecond laser uses the most cutting-edge technology to treat pigmented diseases. Through fast and powerful energy, the pigment in the skin is more finely crushed, and then discharged from the body through the lymph, thereby completely removing tattoos and stains. According to the principle of selective photopyrolysis, the shorter the action time of the laser, the less likely the laser energy absorbed in the target tissue will diffuse to the surrounding tissues, and the energy will only act on the target to be treated. To a certain extent, to protect the normal tissues of the surrounding environment, so the treatment is more selective