Thanks for writing to us.
could be due to stress, lack of sleep, persistent visual strain, iron deficiency
, genetic factors.
If it is hereditary or genetic, it won't respond much to treatment. If the causes are acquired, you may follow these suggestions
Avoid stress, take proper sleep
Get your thyroid and hemoglobin
checked, if deranged take proper medication
Take oral vitamin c supplements
Apply sunscreen in morning and kojivit gel as advised by your doctor
You may take mild chemical peels
to reduce under eye pigmentation
Hope that helps. Take care