Figuring out your skin's undertone is as simple as glancing at the veins on your wrist. This is because the veins are prominent here and their colors are more visible to the eye. According to Healthline, if your veins appear to be greenish, then you have a warm undertone. However, if your veins are blue then you have a cool undertone. If your veins don't really show up at all, then you have a neutral undertone.

The importance of knowing your skin's undertones is so that you can match your makeup to your skin precisely. If you have warm undertones and use a cool foundation, your face would end up looking pasty and vice versa. Also, it helps to know your skin's undertone for your blush and lipstick decisions. Different hues suit different undertones better. Pale skin with cool undertones tends to wear pink natural blush well, but medium skin with warm undertones would probably best be suited to an orange blush.