Read this online. Hope it can help:

1)The most effective remedy for dark circles is also the most cliche. Thin slices of cucumber applied to your eyes not only helps to lighten the skin, but also soothes and cools the eyes. This can be especially comforting if you've been up late the night before or your eyes are red and tired from allergies or staring at a laptop screen.
Lay down on your back (because it's easier to balance the cucumber slices that way). Lay thin slices of cucumber on your eyes, making sure they have contact with the skin under the eyes. Leave them on for 5-10 minutes. It's a good idea to set your alarm clock if you're doing this early in the morning. Be careful not to get cucumber juice in your eyes.
2)The caffeine in tea bags acts as a remedy for dark circles by diminishing puffiness. Caffeine in tea helps to diminish water in the tissues around the eyes (you'll notice that many early eye circle creams contain caffeine for this very reason). In addition, tea contains antioxidants that are beneficial to the skin.

Take a used tea bag (green, black or white) that's been squeezed out. Make sure it's cool! Leave it over your eyes for about 10 minutes. You'll see a noticeable improvement in puffiness and under-eye circles.