"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." To clear things up—for both your skin and your brain—I asked dermatologists to break down everything you ...

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First, back away from the 10X zoom mirror.

Add Yahoo as a preferred source to see more of our stories on Google. To clear things up—for both your skin and your brain—I asked dermatologists to break down everything you need to know about ...