Even when the winter sun sets in the late afternoon, dermatologists say the best sunscreens for your face are a nonnegotiable—and studies further reinforce this advice. We know, we know. You might not want to add that extra sunscreen to your routine. But according to the American Academy of Dermatology, it not only helps prevent skin cancer but can also ward against premature skin aging, such as wrinkles and age spots, caused by UV exposure.