Dermatologists recommend to patient to wear sunscreen all the time. “90 percent of premature skin aging is caused by overexposure,” Dr. Elizabeth Hale, from the Skin Cancer Foundation says. Everyone gets incidental exposures of sun that in some cases can cause sunburn and significant skin damage. Wearing sunscreen on a regular basis can help prevent this. Harmful UV rays penetrate clouds and get to your skin if it’s not protected.