What it is: A two-in-one concealer to help correct dark circles and imperfections for perfect, natural-looking skin. What it does: Its formula instantly blurs dark circles and imperfections while a treatment complex helps reduce signs of undereye puffiness, erase imperfections and hydrate overly dry skin areas. How to use: Apply to dark circles and imperfections by dabbing on lightly, underneath or over foundation and blend with the fingertips. To achieve a perfect color result, opt for a shade that matches your complexion or is very slightly lighter. Style Name: Guerlain Multi-Perfecting Concealer. Style Number: 5224203. Available in stores.