To conceal under-eye bags, choose a creamy concealer that's one to two shades lighter than your skin tone. Typically, one may color correct, using a peach or salmon-toned concealer to counteract darkness. For liquid concealer, use the applicator to dot concealer in the areas of concern. Keep in mind, a little bit goes a long way. Gently blend with a concealer brush to create a natural transition. Press with the warmth of your fingertips to finish. For powder concealer, swirl a small amount of concealer in the cap until it disappears into the brush. Tap away any excess and buff onto your skin in circular motions. Avoid dragging the skin to prevent further irritation.