1. Possible hyperpigmentation.
When the oxidized blood in your body begins to leak from the blood vessels around your eyes you are experiencing a condition known as hyperpigmentation.
It should be pretty obvious if you have this condition because the discoloration under your eye will be accompanied by a noticeable amount of swelling.
This could have been caused by a variety of reasons including, hormones, regular swelling, prolonged sun exposure, and normal aging.
Whatever the cause is, you shouldn't be worried because the condition is practically harmless, and can be easily treated by a few simple changes with your diet and lifestyle choices.