Laser is to gather light into a thin beam, the principle is like using a magnifying glass in the sun, it is the principle of high temperature burning. The laser used in medical treatment mainly cuts off the vegetation on our skin and the soft tissue in our body, and the wound will not or rarely bleed. If it is used to eliminate acne scars, it will leave burn scars and destroy the regenerative function of the skin. If tattoos must be removed, the regenerative function of the skin will not be damaged unless polishing therapy is used.

Burning a smoke scar on the upper side is similar to the principle of laser, because the pigment particles are deposited in the dermis, which is difficult to eliminate.

The laser is shallower than before, but it changes the position of pigment particles and does not reduce the number of pigment particles.