Since blue light treatment falls under the category of physical therapy, it greatly avoids the dangers of using antibiotics. It has been commonly used for acne treatment in Europe and developed regions in Asia. Studies have shown that one month of blue light treatment is as effective as three months of a single oral antibiotic. Since P. acnes lives in the sebaceous glands, a large number of porphyrins, a metabolite of the bacterium, are present in the sebaceous glands, and under blue light irradiation, some of the sebaceous glands are destroyed, resulting in a reduction in oil production and a significant improvement in pore size. Each blue light exposure takes only 15-20 minutes, and the eyes are protected with eye shields during the treatment. After the first course of treatment (2 times a week for 4 weeks) inflammatory acne damage is quickly and visibly reduced, without pain, without hyperpigmentation, and without any disruption to normal work. About 2 courses of treatment can clear away 70-80% of the inflammation, and can be maintained for a longer period of time after the end of treatment. Blue light treatment is especially suitable for patients with large skin damage on the back and chest. Oral or topical application of light-sensitive drugs can enhance the therapeutic efficacy. As the pace of people’s lives accelerates, the demand for speed and efficacy of disease treatment is getting higher and higher. Since blue light treatment does not delay time and has fast results, it is believed that more and more acne patients will be accepted in the near future.