Prolonged exposure to blue light emitted by cell phones and other artificial light sources may cause damage to the basal layer of the skin, leading to dry skin and accelerated skin aging. 1. Damage to the basal layer of the skin: the blue light is a kind of light with a wavelength between 400nm and 480nm with high energy. The wavelength of the light penetration ability is very strong, can penetrate the skin, to reach the dermis, easy to lead to melanin deposits in the skin, and then appear skin darkness, the symptoms of pigmentation. 2. Lead to dry skin: blue light stimulation will affect the skin’s retention of water, leading to excessive water loss, resulting in dehydrated and dry skin, or even peeling. 3. Accelerate skin aging: blue light can penetrate the epidermis and dermis of the skin, causing oxidative damage to cellular DNA, making the aerobic free radicals in the skin become active, causing the skin to lose its elasticity and leading to increased wrinkles. It is recommended that daily life should not be long time application of cell phones, computers and other electronic products, pay attention to the protection, the emergence of uncomfortable symptoms in time for hospital treatment.