Your complexion endures a blizzard of challenges in winter. When not blasted by freezing winds, it’s dried out by heating or ignored under layers of clothing. But a few pivotal changes to your routine can keep skin glowing, youthful and hydrated in this most challenging season. We asked five MECCA skin specialists to share their tips for dealing with fluctuating temperatures, dry skin and chapped lips. Read their advice for saving face when the mercury drops.