1. Neutralize discoloration with a primer that contains color-correcting tints (Stila One Step Correct, $36; at stilacosmetics.com
).The green minimizes redness, lavender counteracts ashiness, and peach conceals dark spots.
2. Use a liquid formula (Lancome Teint Miracle foundation, $37; at lancome-usa.com
) that polishes like a foundation but offers the hydration of a face cream. Apply it with a brush (MAC 190 foundation brush, $32; at maccosmetics.com
3. Keep a small jar of moisturizer in your purse to dab on dry patches and keep your foundation looking fresh.