Undermakeup

Why are the best - dressed faces in the world wearing a green undermakeup creme? ( Or a mauve one?)

Source: wiktionary

To combat the sallow tones, olive, medium-dark or caramel skin-toned girls can use an apricot undermakeup moisturizer.

Source: wiktionary

The undermakeup (primer) should be allowed to dry-set for 30 seconds. Apply foundation over the primer with a sponge using light, careful strokes to blend. Undermakeups come in cream form, sponge-on wands, or sponge-on cream, and as a lotion.

Source: wiktionary

As the name suggests, an undermakeup toner is intended to be applied as a thin film to your face under your ordinary makeup. If, for example, you have a very ruddy complexion or have a dense network of tiny “broken” blood vessels on your face and nose (the so-called "drinker's nose"), you can use a green shaded undermakeup toner to reduce the flushed appearance.

Source: wiktionary