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Problem: Discoloration

As the collagen under your eyes degrades due to sun damage, genetics, and the ticking of the clock, the skin there becomes thinner, and underlying blood vessels can peek through. "This tends to give skin a bluish or brownish tint," Gohara says. To square off against dark circles, try these tips.

Makeup trick: If you've got light skin, go with a creamy concealer that matches your skin tone, recommends Dubroff. On darker skin, a peach-toned product can help neutralize bluish discoloration. Consider trying Catrice Camouflage Cream Wake Up Effect ($6; Ulta.com). Use your finger to warm up the formula (which makes it more spreadable), and press it into the under-eye area from inner to outer corner.

Skincare fix: Again, proven anti-agers like antioxidants and retinol are your best bet. "Retinol stimulates collagen production, thickening the skin and making underlying blood vessels less visible," Goldenberg says. It can be potent, though, so start off by using a product like Murad Retinol Youth Renewal Eye Serum ($85; Murad.com) once or twice a week, working up to nightly use. Your eyes will thank you.