Laser spot removal is to selectively irradiate the local skin tissue with pigmentation by choosing a specific light source, which is absorbed by the pigment particles in the pigmentation in a very short time, resulting in an increase in the temperature of the pigment particles, rapid expansion and vaporization, which will eventually be phagocytosed and cleared by the macrophages in the human body, thus achieving the effect of removing the pigmentation. The effect of spot removal depends on the specific type of spots. Some spots are very effective in treatment, such as nevus of Ota, which rarely rebound after treatment. Some spots partially rebound but have good overall effect through careful preparation and post-treatment care, such as coffee spots and freckles. However, melasma is related to genetics, endocrine and ultraviolet rays, and some patients will rebound after laser treatment, and even aggravation will occur. Although the efficacy of laser spot removal is relatively ideal, it also has certain hazards, mainly including scabbing after treatment, which can easily leave scars due to pigmentation if torn off artificially. Secondly, some patients with sensitive skin may experience edema at the surgical site after the procedure, which usually disappears automatically after 2 hours. In addition, since laser spot removal uses intense light, it is quite harmful to the retina and cornea, and improper operation may damage the retina of the eye and lead to blindness in serious cases. Some patients may suffer from inflammation due to excessive stimulation of the skin, and the pigmentation produced may lead to re-darkening.