Carbon dioxide laser treatment is currently used in clinical practice mainly by fractional carbon dioxide laser. The basic principle is focal photothermal action, through which the fractional laser produces a display of tiny beams of light. The fractional laser is applied to the skin in the form of multiple three-dimensional micro-damage areas, and these micro-damage areas are surrounded by undamaged normal tissue cells, so there is less damage to the treated area and recovery is faster. Carbon dioxide laser treatment is widely used in clinical practice, with fewer side effects, and is easily accepted by patients. It is generally used for the treatment of melasma, various pigmentation treatments, keloids or other skin tumors.