The best thing you can do to keep your skin looking glowing and healthy is tomoisturize your face morning and night. Beyond that, using a sunscreen is also key. Ideally you should apply sunscreen every day, even if you don’t plan on going out in the sun for a long period of time. Dermatologist Diane Madfes, MD, FAAD tells Byrdie that "we are exposed to ultraviolet and infrared light every day that produces free radicals in our skin. These free radicals inhibit collagen production and decrease our elastin. This leads to premature aging, wrinkling, brown spots, and sagging."