Go see a dermatologist. I think I have read that they can do some kind of skin bleaching process under the eye. Even if that is not correct, they will certainly be well-versed in what can be done (diet, vitamin, etc.) to help reduce the dark appearance.
Dark circles under the eyes can be the result of allergies to airborne substances, such as pollen, dust, and pet dander, because people rub their itchy eyes. People with hay fever may notice them at the height of the season. Food allergies or sensitivities can also contribute to dark circles. If you need to seek treatment for an underlying health condition, this needs to be your first priority. If having dark circles under your eyes is something that is prolonged and not just the result of overdoing things the night before, consider seeing a doctor to discuss the possible causes. Some things that might be causing your under-eye discoloration include. Thanks for sharing with us.