There are numerous causes for dark circles, and one of the prevailing reasons is genetics.
Also, the mayo clinic says there are few remedies to dark circle stating makeup and laser surgery as the only true remedies
Here is a list from Wrong Diagnosis
Causes of Dark circles under eyes:
The following medical conditions are some of the possible causes of Dark circles under eyes. There are likely to be other possible causes, so ask your doctor about your symptoms.
* Persistent eye rubbing
* Sleep difficulty - see the many causes of sleep difficulty symptoms (e.g. stress, depression, sleep disorders, etc.).
o Hay fever
o Allergic shiners
o Dust allergy
o Mold allergy
o Eczema - i.e. eczema in the skin under the eyes.
* Pallor - the paleness of the skin may accentuate the dark rings.
* Inherited eye blood vessel condition - dark circles under the eyes run in families.
* Lack of sleep
* Nasal congestion
* Black eye due to trauma
* Frequent eye rubbing
* Phenol sulfotransferase deficiency
* Inherited trait