Dark circles, or "bags" as they are sometimes called, are caused for many reasons beyond fatigue and are a common complaint for people of all ages.
Though such marks under one's eyes are not usually a sign of a medical condition, per Mayo Clinic, they can be a symptom of certain problems that need to be addressed.
Broken blood vessels, tear troughs and bulging valves in the skin can result in dark circles under one's eyes.
As we age, there is thinning of the skin with loss of collagen and fat that surrounds the blood vessels and thus they become more prominent with time.
She adds that aging can also cause a "bunching of loosened tissue under the eyes" that may accentuate any darker pigmentation.
Another common cause of dark circles are allergies. Allergy-induced inflammation causes both puffiness and the urge to soothe itchiness by rubbing one's eyes. That can result in micro-blood vessel ruptures and subsequent bruising.
As these bruises heal, they leave behind a trail of pigmented hemosiderin, a component of hemoglobin responsible for those unsightly under-eye dark marks.
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