[According to ‘makeuptip.com’, directly copy-pasted]
Concealer is more dense than foundation, allowing fuller coverage of trouble spots and hyperpigmentation (red areas). It can be used over foundation or on it own, and has greater staying power. Remember, a little goes a long way!
1. Since the skin under your eyes is more transparent, it tends to look dark, especially at the inner corner near the bridge of the nose. To even out the tone, concealer is a must. Using liquid concealer, gently pat over dark under-eye circles (don’t sweep it across the entire area), then blend with your ring finger.
2. To cover trouble spots and imperfections, apply a thicker cream concealer onto the blemish or flaw. Then lightly press with a makeup sponge.
Tip: Choose the shade of your concealer carefully. When testing out shades, pick one that matches your skin tone or one shade lighter. It helps to use a mirror outdoors to see how shades look on your skin in natural light.
Tip: Prepare your skin with a light SPF moisturizer before applying concealer for a smoother application.