There are six popular color concealer shades: green, yellow, peach or orange, purple or lavender, pink, and red or coral, and they all come down to color theory.
Look at a color wheel — to determine which shade to use, find the color of the discoloration you want to cover, and look at the shade on the opposite side of the wheel.
If you suffer from acne, a green color concealer can take the redness that comes with it away. Since you want to be precise when applying it, using a thin brush is best.
When using a green concealer for pimples, it's best not to blend the edges too much, as you want the green to only cover the red places and not any of the surrounding normal skin.
If you often have dark undereyes, a yellow concealer will work best since yellow is the opposite of blue and purple on the color wheel, and will neutralize those tones.
Yellow concealer might not have to be covered up on fair skin, but those with darker skin tones may need to cover up the yellow concealer as it can be too visible and bright.
There are a couple of ways to cancel out undereye darkness with blush, like using liquid or cream blush and blending it into your concealer before applying it to your undereyes.
The next method is to set your undereye concealer with a light pink or coral blush powder. Pink works with blue and green undereye tones, while coral and orange work for purple.
You’ll want to combat the redness of rosacea with a green color corrector, but since it covers a wider surface, using a foundation brush or sponge is best.
You might be tempted to cover rosacea entirely, but you can embrace your natural redness as blush by only using green color-corrector in spots you usually wouldn’t apply blush.