Keep skin clean, but don't overdo it. Soap up just once a dayat night to remove impurities and makeupwith a creamy wash like Jurlique's cleansing lotion ($34; jurlique.com). Then, drench skin with hyaluronic acid, an ingredient that binds up to 1,000 times its weight in water. We like Philosophy's When Hope Is Not Enough serum ($38; philosophy.com).