Stress – When the body is undergoing stress, it channels blood away from areas such as the face, to the main organs that need it more. As a result of less blood supply, the face acquires a drained and pasty complexion. The dark circles under your eyes can look even more pronounced, when contrasted with the skin color on the rest of the face or body.
Collagen Loss – As we grow older, loss of elasticity and decreased ability to regenerate, leaves our skin thinner. This is the reason why, despite sleeping longer hours,, aged persons usually have periorbital dark circles that are more pronounced.
Periorbital Hyperpigmentation – This is a condition wherein the skin beneath the eyes, produces more melanin, leading to darker coloring or pigmentation of the specific area in higher quantities.
Genetics – Our genetic makeup also has a major say in the appearance and severity of dark circles under the eyes. As a result, some people are more prone to dark circles formation. Particularly, if you are born with very pale skin, then you are more likely to suffer issues with darker pigmentation. Moreover, broken capillaries are likely to stand out more prominently on your skin.
Iron Deficiency – Sometimes, dark circles can be an indication of iron deficiency conditions such as anemia. In people suffering from less iron in their body, the red pigment, hemoglobin, which transports oxygen to cells, gets broken down very easily, imparting a dark or bruised look to the skin in areas below the eye.
Broken Capillaries – The thinnest and most delicate skin area around your face, lies just below the eyes. Being the most sensitive skin areas on your face, the capillaries located under this thin dermis, are more prone to breaking, generally due to stress or exposure to harsh sunlight. The blood cells that spread out from these spaces, usually gather just below the skin surface, to oxidize and form a dark purple hue.
Sunken-Looking Eyes – With advancing age, the bones forming the orbit tend to shrink and enlarging the orbital cavity. Some of the periorbital fat which cradles and cushions the eyes, is lost with the passage of time. As a result, we end up with sunken-looking eyes, making the dark circles look worse.