The majority of society associates dark skin under the eyes with lack of sleep. And in this case, they are usually right- lack of sleep is one of the leading causes of this condition. If you find yourself too busy to find sleep, try to take naps here and there when there are down times in your schedule. Not doing so may lead to poor blood circulation and a worse discoloration.
Hereditary causes of this condition have been proven to be in effect. This means that if one's parents have a history of having the condition, then one can expect that they too will have some sort of "run in" with the condition as well. There are still solutions open to those who have a hereditary condition of dark circles under their eyes, but some of the more simple solutions probably won't work.
Most remedies for dark circles under the eye will include treating the areas while one sleeps. Different chemicals, wraps, or peels can be applied under the eye for optimal chances in showing progress in returning the skin back to its normal color. Cucumber slices are commonly used in this scenario, in which case they refresh the skin under the eyes and reduce puffiness.
Oddly enough, you might also try to use tea bags in place of cucumbers or other facial remedies. Tea bags will contain what is called tannin, a substance that has been proven in studies to act much like the cucumber slices do. The tea bag materials can be applied with water, applied to a damp cloth, and let set for 15 minutes. If you want to reap maximum benefit, try getting a full night's sleep with the mixture on.
If one has access to vitamin K, which is in most types of beneficial skin creams, it should be applied under the eyes on a daily basis. Another common cause of dark circles under the eye is the lack of vitamin K, in which apply a cream will return the vitamin K levels back to normal. Most people see a significant difference in skin discoloration from this solution alone.
Final Thoughts
Skin discoloration is hard to fix, but if nothing seems to work out, try simply covering the dark circles up and continue your routine for at least a couple of weeks. If nothing works out, you may try consulting a phsycian to see if there is an underlying cause that you may not be aware of.