Use it: If you have sensitive skin.
How it works: A time-tested, gentle acne fighter, sulfur “acts like a sponge to draw oil out of blocked pores,” says Dennis Gross, a New York City dermatologist. This dries up pimples and keeps sebum production in check, helping to prevent future blemishes. Try Kate Somerville EradiKate Acne Treatment ($24, katesomerville.com). Dab directly onto spots with a clean cotton swab (and don’t double-dip).
Good to know: Sulfur has a distinct smell—think rotten eggs. Most preparations that use it contain a masking fragrance. But to play it safe (and avoid scaring off coworkers), apply these products at night.