Well there are so many reasons which can cause dark circles. Sometime it happened due to lack of sleep and sometime if you took nap more than enough . Excessive use of Alcohol , drugs. Fatigue,illness, stress, allergy , unbalance diet, water deficiency and to watch t.v or mobile screen continuously for a long time. and so many more...
1: Cut a fresh cucumber into thick slices and chill it for about 30 minutes.
2: Place the slices on the dark circles for about 10 minutes.
3: Wash the area thoroughly with water.
4: Repeat this process twice a day for one week to see results.