The effect of picosecond laser is relatively good, and picosecond laser is better than nanosecond laser in treating pigment diseases. A shorter pulse width means that smaller pigment particles can be solved. Generally speaking, the pigment particles solved in picoseconds are relatively small, about 13 times less than nanoseconds. For example, in 450 nanoseconds, relatively small particles of several μ can be solved. In addition to vascular diseases, picosecond laser can also treat pigmented diseases, whitening, coarse pores, fine lines, etc., which is better than intense pulsed light.