There's a fine line between skin care that makes you look dewy and skin care that makes you look (and feel) greasy. Sunscreen often straddles that fine line. Some formulas leave a powdery white cast on deeper complexions ; others make your pores look like they've been dunked in a deep frier. Neither of those side effects are cute, but what's really not cute is skipping out on protecting your skin from the sun — so finding the right sunscreen is crucial.