This is one of the most common complaints people have: dark circles under their eyes. In most dark skins(90%) the cause is always excessive Melalin deposits. Confusion arises only in Light skins when dilated blood vessels are seen.
If you apply pressure to the circle or shadow and it disappears, your problem is due to visible blood vessels underneath the thin skin of the eye area. If the color doesn’t disappear, the darkness is caused by excess pigment. And if the shadow forms at the inside corner of your eye, where a tear would flow, it’s probably due to a deep tear trough (see the “before” photo above).
Other causes and treatments:
One other cause for dark circles under the eyes only occurs in patients with seasonal allergies. These people develop the so-called “allergic shiners”, which is essentially pigment caused by constantly rubbing their itchy eyes. We treat these dark circles with bleaching creams and with allergy medicine to stop them from itching and rubbing.
Effective Melalin reducers here are Arbutin,Kojic ,Dioic acid,Phytic acid,Ferrulic acid &Vitamin C.