There are many contributing factors that make dark circles around the eyes more noticeable. These include:
Age - The skin thins as we age. With the skin being thinner the blood vessels underneath become more apparent.
Allergies - Although allergies are often the blame for dark circles, anything that causes chronic nasal obstruction can be a culprit.
Diet - Drinking caffeinated beverages
Fatigue - Due to lack of sleep
Heredity - Tendencies such as allergies or weak capillaries pass on from generation to
generation
Overexposure - Caused by the sun
Natural pigment - commoner in those of Asian, Indian or Mediterranean descent
De-oxygenation of the blood vessels which makes the blood less pink/more blue - Occurs when you are in an upright position for a long time and is often seen in people who are tired
