Photorejuvenation has the effect of lightening pigmentation, improving redness, and shrinking pores, but it is prone to adverse reactions such as heat pain, facial flushing, scabs and blisters, as well as hyperpigmentation. The main working principle of photorejuvenation is to use a certain wavelength of broad-spectrum energy, while irradiating the skin, it can penetrate to the deeper layers of the skin and act on the pigment cells and vascular tissues inside the skin, which can help regenerate the collagen inside the skin and promote the orderly arrangement of collagen fibers, so it has the effect of fading pigmentation, improving redness, shrinking pores and removing fine lines. Although photorejuvenation has certain effects, it sometimes has some side effects due to differences in treatment programs and individual skin types. For example, it can produce hot pain, facial flushing, serious cases of scabs and blisters, and even hyperpigmentation, which can lead to the consequences of skin darkening. In addition to this photorejuvenation is not suitable for everyone, for those who are in pregnancy, suffering from epilepsy, sensitive skin and prone to bleeding tendency is not suitable for photorejuvenation. Photorejuvenation should be evaluated and operated by professionals, and the skin should be moisturized and protected from the sun after the treatment.