Nutritional deficiencies and sun damage can cause this kind of problem. Other pigmentation disorders should also be ruled out. Chemical peels work best for all these problem. Also a sunscreen is needed to protect you from sunlight at all times. Dark circles are a common problem but the cause for it has to be determined. Most of the times, it's genetic that is it runs in the family. But inadequate sleep and nutritional deficiency or working on laptop for long hours can also cause this. Please get your hemoglobin checked. Creams can be tried, which are specially made for treating pigmentation on this area. Chemical peels have best  a results for dark circles. You can consult me for detailed prescription and all other precaution to be taken.