What Causes Dark Under-Eye Circles?

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If you have under-eye circles and they're not going away even after you've had a goodnight's rest, it may actually be allergies. When you have allergies they can dilate the blood vessels around the eyes and give them a darker appearance. So if you notice this is happening to you, try to stay away from things you're allergic to and take an antihistamine, and they should go away.