Cell phones and other artificial blue light may be harmful to the human skin, long-term use of cell phones before going to bed, receive blue light exposure, may lead to decreased sleep quality, resulting in dull skin, elasticity and other hazards. Decrease in sleep quality: If you use cell phones, computers and other electronic devices before going to bed, blue light will inhibit the body’s melatonin secretion, resulting in the body will be in a state of excitement, thus affecting the quality of sleep, which in the long run may cause skin dullness, elasticity and other hazards. Therefore, in the use of cell phones or tablet computers and other artificial blue light devices, it is best to do a good job of skin care, reduce the use of cell phones before going to bed, in order to reduce the skin damage caused by it.