Choosing a shade will depend on how light or how deep your skin tone is. Just like your lipstick shades, complexions may also vary because of the underlying tone. Think of your undertone as kind of like your background color. You may be dark or fair but your skin will always have that underlying color tone to it that makes your skin either warm or cool. Warm undertones have a yellow, sometimes a bit of green tinge to their skin and cool undertones have pinks and reds underlying their flesh. Lipstick colors that have more yellow or orange to them compliment warm tones and those that have more blue complement cool tones. See the picture presented above, it is a warm deep mauve color and it compliments all these skin colors because they all have one undertone and that is yellow – and a bit of olive.