Nobody likes to look as if they’ve been socked in the eye. While a bad case of periorbital dark circles (PDC) – a.k.a., dark circles under eyes – will most likely not produce such a dramatic effect, they can cause a bit of embarrassment and self-consciousness all the same.
PDC is the result of a thin layer of skin under your eyes containing more blood than other places in the body. Accumulation of blood beneath the skin’s surface creates the swollen effect that is common among those with dark circles under eyes.
Perorbital dark circles are dark blemishes around the eyes. There are many causes of this symptom, including heredity and bruising. ~ Wikipedia
Put simply, age, genetics, or environmental factors cause the appearance of dark circles underneath the eyes. Genetic predisposition is exceptionally common; if your parents or grandparents have them, the chances are pretty good that you will as well.
As you likely already know, dark circles underneath your eyes is not a dangerous condition. They do often appear as a symptom of various illnesses, however.
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