Hey, Facial aging and dark circles Volume loss or fat descent in the cheeks under eye volume loss, lower eyelid (canthus) laxity ,Thinning under eye ,skin bulging under eye fat, are some of causes. Get enough rest. Sleep deprivation only makes dark eye circles more obvious.A gently applied black tea bag or cold compress can reduce blood vessel dilation.To decrease pigmentation, protect against the sun by wearing (large) sunglasses.Slight elevation of the head during sleep will help prevent fluids from draining toward the eyes.