Concealer: The Great Cover Up
Remember when concealer had the consistency and color of Spackle? Not anymore. These days, concealers are lighter and creamier, and they come in almost as many shades as foundations do.

Most flattering formulation: Choose a creamy concealer that comes in a pot or with a wand (such as Almay Extra Moisturizing Undereye Cover Cream or Almay Time Off AgeSmoothing Concealer). They're sheerer and lighter than stick formulations, so they won't look thick or chalky when you wear them. They're also easier to blend than stick concealers and won't drag across the thin, delicate skin under the eyes.

Can't go wrong colors: Choose a concealer one shade lighter than your skin tone, says Geller. To find a perfect match, go to a store where samples are available, then dab a bit on your cheek and head outside (or to a window) with your compact so that you can view the shade in broad daylight. (As awkward as this sounds, you'll only have to do it once.)

Perfect application: Apply concealer after foundation. "This way, if your foundation covers the flaw, you can skip it altogether," says Geller.

Here's how to camouflage dark circles, a common problem for women with mature skin, says Geller. Using a small, soft brush or your finger, dot a tiny amount of concealer under each eye, from the inside corner to the middle. (Don't extend it to the outside of the eye because it will eventually seep into crow's feet.) Then blend the product into your foundation with your finger or a tiny brush until you can't see it anymore. Blot off the excess with a tissue or cotton square.

Tips and tricks: If the skin under your eyes is very dry, pat on a light eye cream before you apply concealer, says Geller. It will make even a sheer concealer sheerer.