Dior Flash Luminizer Radiance Booster Pen delivers adjustable coverage to your skin that helps boost radiance and catch the light to erase dark areas and highlight facial contours while covering signs of fatigue. It fills in lines and wrinkles, too and features a professional blending brush for finger-free dabbing. How to use: Apply under or over foundation in light touches to brighten, revitalize or sculpt the five key areas of the face-on