The most obvious reason is that it will help you find the perfect shade of foundation and concealer—the one that truly looks identical to your skin. It can also help you experiment with makeup. Perkins says that if you want something natural and fresh, keep the makeup tones within your tone family.

Why is undertone important?

Knowing your undertone can also really help you to find the right foundation that will enhance your complexion and give it a healthy, refreshed glow. For example, if you have a warm undertone, choosing a foundation with a cool undertone can make you look pale and washed out.

Do undertones matter for foundation?

You've heard it your entire life: Your skin's undertone makes a huge difference in the type of makeup you should be wearing. Here are seven legitimate reasons your skin's undertone doesn't matter, and why you shouldn't get so hung up on warm vs. ... cool.