You don't want to look like you're wearing a mask after you've applied makeup, so it's important to choose a foundation that matches your skin tone. This may sound easy, but it's often difficult to find the right shade.
To simplify the process, first determine whether you have warm or cool undertones. If your skin appears golden, bronze or olive, then you probably have warm undertones. People with this skin type usually look best in nude, beige or pink foundations -- these tones help bring out the natural colors in your skin. People with skin that's pink, rosy, beige or brown have cooler undertones and should use foundations with light porcelain or pale brown hues that will give skin more color [source: Beauty and Nutrition].
The next time you're looking for foundation, try a few different products before you buy. Test potential foundations on the skin along your jaw line -- the shade that matches your neck and face is the right foundation for you. If you have oily skin, makeup may turn darker when you apply it. To test, you may want to try a shade that's a bit lighter than your skin and then wait 10 minutes to see if the foundation turns the correct shade [source: Pearl].
For more information on choosing a foundation, see the links on the following page.