Photorejuvenation is the application of specific intense pulsed light, directly irradiated on the skin surface, which can penetrate deep into the skin, selectively act on skin pigments or blood vessels, destroy pigments, close abnormal red blood vessels, effectively treat skin surface imperfections, improve skin elasticity, color and delicacy, and maximize consumers’ pursuit of a high-quality image. However, photorejuvenation also has certain hazards, as follows: 1. When performing photorejuvenation treatment, if the photon energy is too large, it will burn the skin and play a counterproductive role, and the skin will easily become abnormally sensitive after the operation, with itching, redness and peeling; 2. If the treatment measures are not standardized, it may lead to skin cell damage, and the skin will not be able to repair and protect itself, resulting in facial melanin precipitation and pigmentation is aggravated. In addition, when the human skin’s stratum corneum is damaged, the skin will lose its protective barrier, nutrient loss will be accelerated, the skin state will be unbalanced, accelerating aging and having the risk of rebound; 3. After photorejuvenation, due to a series of reasons such as strong skin stimulation, accelerated metabolism, increased local temperature and weakened sebaceous membrane protection, it will lead to skin dehydration. Therefore, a lot of water must be replenished after treatment to maintain the effect.