Find the cause whether it is due to night time awakening or some cosmetic you are applying under eyes or it is just effect of light (Tyndall  effect)or it is hereditary. Take plenty of fluids, sleep at night at right time. Apply cetaphil moisturing cream around eyes in day time & Fixderma under eye cream at night on dark circles for 3 months. 20 % to 80% improvement depending on the cause.If there is no improvement ,consult dermatologist with MD or DNB Dermatogy qualification.

Hello You can read my health tip on under eye dark circles available on practo healthfeed

take nutritional diet, be tension free and perform yoga.