Photorejuvenation is a technique with cosmetic treatments developed in the last 10 years. It can be said to be the twin brother of hair removal. In our hair removal process, we find that after repeated hair removal treatments, the skin in the hair removal area becomes relatively smooth and beautiful. Of course the first to notice this interesting phenomenon was the American dermatologic laser doctors who were surprised to find that when facial hair was removed, the skin became visibly younger. Of course, not all doctors were interested in this. One of them, a famous skin laser treatment doctor in San Francisco named Bitter, was very interested in this phenomenon and conducted a lot of research. It turned out that this rejuvenation of the skin after hair removal treatment was not a coincidence, but a real qualitative change in the skin structure due to laser irradiation, and found that the laser was not the ideal light source, but that intense light was the most suitable light source. As a result, a method of treating photoaging skin with pulsed intense light was invented and born. After about five exposures, the skin structure changed significantly: the elasticity of the skin became less saggy, the pigmentation of the skin disappeared, and the fine wrinkles began to fade. The combined result is younger and more beautiful skin. So, when this treatment became available, it was immediately popular with Hollywood movie stars, who flew from Los Angeles to Dr. Bitter’s clinic in San Francisco to receive this miraculous treatment. Of course they gave the treatment a very interesting name: photo rejuvenation, which means the rejuvenation of the skin with light, a word that was later translated as photorejuvenation. In recent years, photo rejuvenation has been given a lot of unrealistic content under commercial packaging and copycats. In short, photorejuvenation is actually a cosmetic treatment that uses pulsed intense light (IPL) on the skin to eliminate/lighten various skin pigmentation spots, enhance skin elasticity, eliminate fine wrinkles, improve facial capillary dilation, improve facial pore size and skin roughness, and also improve yellowing skin color, etc.