Skin laser treatment is not to shine red light, the laser has selective photothermal effect, refers to the specific color base in the tissue selectively absorbs the laser, the temperature rises, and to the surrounding neighboring tissues to occur heat conduction, can cause selective damage to the target target, while the normal tissue damage is small. There are several main types of lasers commonly used in dermatology. According to the nature of the medium in which the laser is generated, they can be divided into gas lasers (carbon dioxide lasers), liquid lasers (dye lasers), and solid-state lasers (ruby lasers, emerald green lasers, and Nd:YAG lasers). According to its emission mode can be divided into continuous laser (argon laser), quasi-pulsed laser (copper vapor laser) and pulsed laser. On the basis of pulse width, pulsed lasers can be categorized into long-pulse lasers (which have a pulse width of milliseconds) and short-pulse lasers (which have a pulse width of nanoseconds or picoseconds). Skin laser treatment is not shining a red light. Patients are advised to go to a regular hospital and undergo laser treatment of the skin under the proper operation of a doctor.