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picosecond laser is the medical technology that removes black spots and purifies the skin.picosecond laser uses very short pulse output mode, instead of thermal effect, by the principle of light mechanical shock wave, pigment is "shattered" into finely granular via focused energy,are more likely to be absorbed by the body metabolism. since the laser pulses is extremely short in nanosecond and comes with super high energy, the pigment mass would swell quickly and break into small pieces, which will be eliminated through metabolism. the pigment become lighter gradually and finally disappear..syi