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the use of laser instantaneously emits high energy to effectively break down the pigment in the diseased tissue, so that the irradiated pigment particles absorb the energy to expand and rupture. a part of the pigment breaks into tiny particles and is excreted, and part of it is swallowed by human macrophages. through the lymphatic system excretion, thus eliminating pigment. since the normal tissue does not absorb laser light of a fixed wavelength, the integrity of the cell framework is maintained, and no scar formation condition occurs..syi