What Ashley Benson Tells Us: "I refresh my skin with a cucumber mask, followed by a lot of moisturizer." What the Expert Says: NYC-based dermatologist Dennis Gross maintains that cucumber extract helps attract and bind moisture to skin. No cuke-infused potions in the medicine cabinet? Apply Dr. Jart’s Water Fuse Water-Full Hydrogel Mask ($42 for 5, sephora.com) for 15 minutes. The cool-to-the-touch patch drenches skin cells with hydrating hyaluronic acid.