Serving size: A rice grain

Drowning a pimple in a pool of product doesn't mean it'll heal faster -- it simply means you risk irritating surrounding skin (and wasting what little product is in that tiny tube).

Serving size: A pea for foaming formulas, a small red grape for cream and gel formulas

The addition of water to cleansers gives a relatively small amount of product legs. Use fingertips to lightly massage into skin for at least 30 seconds and rinse with warm water.

Serving size: An almond

You can be a little more generous with rich night creams than serums because your skin goes into repair mode while you sleep. Stay within the size of almond to avoid an oily, greasy face in the morning.

Serving size: A cherry tomato for masks applied to the entire face, a grape for targeted masks applied to specific areas, like the T-zone

Pore refining masks can zap your skin of moisture if over-applied. When applying to targeted areas, use only a grape-sized amount. For the whole face, use as much as cherry tomato.