As a spot concealer, apply a shade close to your base color with fingertips or your favorite complexion brush.
For under eye color correction, choose a shade 1-2 shades lighter than your spot concealing color to brighten and enliven.
Undertones and depth of color can be used to create full-face complexion enhancement. One shade can conceal beautifully, while two can enliven your whole face with highlight, contour, and overall coverage. Select one shade slightly lighter than your natural skin tone to highlight, one shade slightly darker than your natural skin tone to cast shadows, and mix both for the perfect all-over foundation shade.