These dark under-eye circles are nothing to worry about but never the less they are still annoying. Extremely annoyed with mine I decided to investigate. My first question was why? I found a general consensus from my readings, that dark under-eye circles are caused by weakened capillaries around the eyes, and just like eye color and skin tone this is a gene that we inherit from our parents. They can also be caused by: nasal congestion, allergies, lack of vitamins, poor adrenals, bad circulation, broken vessels and more.
Next I wondered what I could do to make mine less noticeable. I found the obvious cosmetic surgeries and injections that are not only pricey but also unnecessary. So how can you tame those dark under eye circles without getting surgery or needles in your face?

Using cucumber slices over your eyes for 10-15 minutes a day can actually refresh the skin and give your eyes a little pick-me-up.
Using cool tea bags (wet them down and then put into fridge to cool) over your eyes for 10-15 minutes can reduce discoloration. Some people state that caffeinated tea bags work best; I personally prefer green or chamomile tea bags.
Frozen Spoons
You can also put frozen spoons over your eyes and hold them there until the spoons become warm. I personally do not think this method is most effective, but it works for some people.