To remove dark circles under your eye, you should make a paste of honey one tea spoon mix turmeric powder, gram flour 1 tsf, if you can get sandalwood powder take 1/2 tsf about 1/2 tsf of lemon juice apply to the effected part leave it for about 20 to 30 minutes and wash with gentle warm water. Do this for 15 days you will find a great change.
I'm assuming you mean under your eyes? They make creams that are supposed to help. But one trick I've heard of and my daughter swears by is sticking a spoon in the freezer and then laying the cold metal against the skin around your eye, it helps reduce puffiness and makes the dark circles look lighter.