Dark circles aren't usually about changes in the color of the skin at all, although some families do have hyper-pigmentation that is passed on genetically.
With age, the skin around the eye thins and loss of fat and collagen, makes the tiny reddish-blue blood vessels just below appear more obvious. The loss of volume in the area around the eye also exposes the orbital bone, creating a hollow trough that shows up as a dark circle. Swelling that leads to puffy or swollen eyelids can cause shadows that make the area under the eyes appear darker as well.
Allergies (environmental or food), colds, sinus infections, rubbing your eyes frequently, going to bed with makeup on, and excessive drinking, can lead to water building up under the eye. Sinus congestion causes the veins around your sinuses to become darkened and dilated.
Eating salty food or crying can also cause under eye puffiness because water travels from areas in the body where there's low salt to tissues where there's more salt.
Sleeping on your side or stomach can encourage fluids to collect under your eyes. Lack of sleep makes you paler and more hollow-eyed, so shadows and circles you already have become more obvious.
Smoking causes your blood vessels appear more prominent and bluer.
Having low thyroid hormone causes paleness, dry, itchy skin, and puffiness around the eyes as well as being anemic therefore check with your physician about testing.
Some medications can provide side effects such as puffiness of the eyelids or edema so make sure to ask your pharmacist.
So what can you do?
If you are prone to allergies eliminate the main food allergens dairy and gluten.
Cucumber slices have long been used to reduce puffiness and refresh the appearance of skin around the eyes, providing a fast "pick-me-up" for tired and puffy eyes. Place a slice over each eye, extending over the darkened area. Do this as often as you can, coupled with lying down for 10-15 minutes. Keep your eyes closed.
The tannin in tea bags (non-herbal) reduces swelling and discoloration. Lie down, preferably in the morning, and leave the cool and damp caffeinated tea bags over your eyes for about 10-15 minutes. Keep your eyes closed. Refrigerate them for 10 minutes before using or leave them there overnight to use in the morning.
Make sure you stay hydrated with water particularly if you drink a lot of caffeinated beverages. Drinking water does not cause fluid retention, a lack of water does.
Irrigating the nasal cavity with a neti pot -- a device that looks like a small teapot -- can help relieve fluid buildup caused by allergies, sinus congestion, or a cold. Use NettiXlear (Xlear) solution.
Topically use Brilliant Peptide Restorative Eye Complex (Skin by Ann Webb). I started using this a few months ago and what a difference. My patients and customers love it too! It protects collagen network, reduces dark circles, tones skin and tiny under eye blood vessels and reduces wrinkles!
By the way you only need a very tiny amount and Your Eyes will look awesome again!