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SLIDESHOW

Foaming
Who doesn’t love bubbles? When applied to skin, these masks (also called oxygenating) cover your face with carbonated suds. It’s like you’ve dunked your head in a frothy bath. But the delightful fizz—caused by chemicals reacting with oxygen—doesn’t actually do much to pull dirt and impurities out of your pores, warns Wilson. Any clarifying result is more likely caused by cleansing ingredients or add-ons like oil-absorbing kaolin and bentonite or acne-fighting sulfur.

Best for: Oily skin types or urban dwellers who need a good detox.

Try: Clinique Pep-Start Double Bubble Purifying Mask ($24.50; Sephora.com)

Next: Check your skin smarts. Here are six things you need to do to get the most out of any mask.