Picosecond laser freckle removal effect is still very good, picosecond has two great advantages: first, the pulse width is short, picosecond is said to be the unit of time, the laser normally acts on pigment cells, not continuously hitting on it, but intermittently hitting, the intermittent time interval between two lasers is called pulse width, picosecond is said to be the time between two laser intervals, the shorter the interval time is the blood freckle pigment cells can be well broken. Picosecond is to shorten the time to a very small unit and release the very high energy in a very short time, which then can greatly improve the efficiency of freckle treatment. Secondly, due to the short interval between two lasers, the instantaneous release of energy is large, and most of this energy acts on pigment cells, so there is little damage to normal tissues, therefore, picosecond treatment is highly efficient and has little damage to normal tissues. Of course, there is also super picosecond which is shorter than picosecond and is also a good treatment method.