IT Cosmetics Bye Bye Under Eye Concealer helps minimize under-eye imperfections, including dark circles, discoloration, dryness and puffiness, while keeping skin younger-looking. Vitamin K brightens as collagen improves elasticity to minimize the appearance of fine lines and crow"s feet. May also be used to cover blemishes for a smoother, even complexion. Neutral Medium is ideal for medium skin tones.