Cell phone blue light is generally harmful to the skin. Cell phone blue light can cause skin aging, formation of pigmentation and skin allergies. 1. Skin aging: The wavelength of blue light is between 400 and 480 nanometers, which is a high-energy short-wave light. The penetrating power of blue light is general, destroying the mitochondria of epidermal cells and causing damage, thus making oxygen free radicals more active, aging and damaging the skin. 2. Formation of pigmentation: blue light can also form pigmentation, long-term blue light irradiation can make melanocytes more active, increase melanin synthesis, and form pigmentation on the surface of the skin, such as chloasma, freckles and so on. 3. Skin allergy: In addition, there is a possibility that the blue light energy is too high, and the long time irradiation causes skin allergy. So cell phone blue light is generally harmful to the skin. In daily life, you should avoid looking at the cell phone for a long time to avoid the damage caused by cell phone blue light on the skin and eyesight. It is recommended to go to the hospital in time after the appearance of skin problems, under the guidance of the doctor for symptomatic treatment.