What is the cause of having dark circles?

Under your eyes?: Often dark circles under the eyes are a sign of allergy. If you are also having itchy watery eyes or nose, or shortness of breath/cough/wheeze, you need to be seen by your doctor. An allergist can best help you with this.

Dark Circles: Circles under eye can be due to: allergy "allergic shiners", fatigue, genetic variation, aging. Lower lid skin is very thin so blood vessels under skin can make area look dark. Various topical remedies try to proclaim help but only mask the condition with no cure. What helps: drink 8 cups water/day, sunblock, hat, enough rest; avoid rubbing; makeup; facial plastic surgery when severe.