Dark circles are common among the busiest of people who can't afford to sleep 8 hours a day. You can use natural diuretics, such as green tea, one week before your period starts. BTW, the best product to conceal dark circles and underline winkles is a pair of dark sunglasses. Stars usually wear it when they are without makeup.
If your dark circles are caused by lack of sleep, then you should get enough sleep. After you get enough time to rest, your dark circles will disappear on their own. If I don't have enough sleep, I also get dark circles. But when I get enough sleep, they disappear.
I've often heard that tea bags or cucumbers can help get rid of dark circles. You can try placing the tea bag or some cucumber slices on the part of dark circles for several minutes a day and see whether they do work to get rid of your dark circles.
What I usually use to get rid of dark circles is eye cream that contain vitamin C or K, alpha hydroxy acid and kinetin. You can get them Over-the-counter. If you have chronic and severe undereye circles, you may first find the true reason that cause dark circles.
Dark circles can treated with regular and gentle care. Cover your eyes with cotton soaked in warm milk for 15 minutes everyday to remove the dark circles around your eyes or dip cotton pads into freshly extracted mint juice, flatten them and place them on closed eyelids for 10 to 15 minutes.