Dark circles under your eyes are, in most cases, the result of a genetic predisposition. Dark circles occur when blood vessels under your eyes can be seen through your skin, appearing bluish or reddish-colored. The skin around your eyes is naturally quite thin, which can make dark circles appear even worse.
Factors such as slow circulation (due to lack of sleep), stress, increasing age, fatigue, iron deficiency anemia, dehydration, and seasonal allergies may also contribute to this problem.
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