There are three main principles of photon rejuvenation: a. Photons can penetrate the skin without damage, and are selectively absorbed by pigment clusters in tissues and hemoglobin in blood vessels, so that dilated blood vessels, pigment clusters, pigment cells, etc. It is destroyed and decomposed without destroying normal tissues and cells, thus achieving the effects of removing spots, whitening and removing red blood. B. Photons act on skin tissue to produce photothermal and photochemical effects, promote the regeneration and rearrangement of collagen fibers and elastic fibers, restore the elasticity of facial skin, eliminate or reduce wrinkles and shrink pores. Thereby playing the role of anti-aging and skin rejuvenation. C, photons can effectively act on the sebaceous glands of the skin, regulate and inhibit the function of sebaceous glands, thus improving oily skin. Photons can penetrate the skin, reach the lesion, and kill invading bacteria through their light energy and photochemical action, thus achieving the effect of sterilization and acne removal. Photons can penetrate the skin, reach the root of hair follicles in the deep layer of the skin and destroy the hair growth center, thus achieving the effect of skin depilation.