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In many spas and salons I have seen people place a cold cucumber on their eyes.
I think this might be for coolness, but why a cucumber?
And Is it actually for coolness or for something else (like lightening of dark circles, etc.)?

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Cucumbers have an anti-inflammatory effect that reduces puffiness. The vegetable not only has a high water content, it but it's often stored in the refrigerator and comes out cold. This means that the water hydrates your skin, and the cool temperature decreases the flow of blood to the space around your eyes. Together, additional hydration and reduced blood flow can sooth the skin around your eyes and alleviate swelling

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Also it has silica.

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...What does the silica do? It'd also be appreciated if your answer wasn't entirely a direct quote from the article. –  LanceLafontaine May 22 '12 at 15:04
    
@Lance made it cw. –  Sniper Clown May 22 '12 at 20:32
    
@Mahmud can u please provide some more info? –  Ashu May 25 '12 at 3:46
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