Picosecond is a new type of laser equipment, which shortens the pulse width compared with the traditional method, making the laser energy unusually large to break down pigment cells instantly. How does “picosecond” remove spots? Before we talk about the principle of picosecond spot removal, we need to clarify the principle of laser spot removal, because picosecond is a laser. The first point is the photothermolysis effect of laser. When the pigment cells absorb enough heat, they will expand, break up and then metabolize from the body parts or fall off from the surface of the skin. This is the principle of laser photothermolysis. The second point is light fragmentation. After that, these pigment cells will be turned into some fragments, and these fragments will be recognized by our immune cells and swallowed up as time passes, and then metabolized out of the body by the body’s lymphatic metabolic system. The above is the principle of the picosecond laser for spot removal.