These are my under eye circles, untreated but after four months of Retin A on the rest of my face. Dr. Marmur of Mount Sinai says they are caused by both melanin deposits and loss of fat pads under the eye. In the first photo you can see that there is a depression in facial contours under the eye. That dip is part of aging. Look at a baby or a child under age 10. No depression in that area. The darkness in the skin due to melanin which may, and the operative word here is “may” respond to skin lighteners like kojic acid or hydroquinone. But to make a bigger difference I will need injectable fillers to erase the shadows. The idea of injecting stuff under my eye makes me cringe, so I’ll see how far I can get with under eye creams and gels.