One of the reasons our pore size appears bigger or more noticeable is due to aging. Though normal, we can help our skin remain elastic and strong by protecting it from the harmful effects of sun exposure, explains Dr. Sheilagh Maguiness, MD, a dermatologist and the co-founder of Stryke Club. “Over time, UV radiation from the sun will take a huge toll on your skin, reducing the elasticity, breaking up collagen and making the skin laxer in general. Ultraviolet radiation from the sun can literally make your pores larger over time,” she says. So, try your best to avoid excessive sun exposure, as well as tanning, and reach for your SPF 30+ sunscreen every day — even indoors, since some forms of UV light can penetrate most windows or glass, she recommends.