The formation of freckles is mainly due to the excess melanin produced by melanocytes in the basal layer of the skin epidermis. Freckles usually appear after the age of 5 and have a certain genetic tendency, and there are more women than men. The incidence of pigmented nevus is also higher in people with more freckles, and compound color light is preferred for freckle treatment. The principle of photoluminescence is 570-950nm broad spectrum color light irradiated to the skin, the skin target tissues, such as pigment, hemoglobin in capillary expansion and dermal collagen layer will selectively absorb photon energy and produce certain optical effect, the pigment and capillary expansion will be gradually decomposed and absorbed and metabolized out of the body by the muscle, so as to achieve the effect of treating capillary expansion and pigmentation. Because the normal epidermis rarely absorbs photon energy, so it will not be damaged. Broad-spectrum intense pulsed light in which the longer wavelength photons can stimulate the skin’s collagen fibers and elastic fibers to rearrange and increase, so that skin elasticity increases, at the same time, the function of vascular tissue is enhanced and circulation is improved, the joint existence of these effects, so as to achieve the treatment effect of eliminating wrinkles and reducing pores.