Dark Circles Under Eyes: Causes and Evidence

Dark circles are not one condition. Dermatology reviews list at least four separate mechanisms that produce the same appearance: excess pigment, visible blood vessels under thin skin, shadow cast by facial contour, and post-inflammatory darkening from rubbing or dermatitis. Most people have more than one at once, and that is why single remedies so often disappoint.

The four mechanisms behind one appearance

• Pigment. Melanin deposited in the skin of the lower lid, producing a brown hue. This is the most common presentation by a wide margin.
• Vasculature. The skin here is among the thinnest on the body, so the venous plexus beneath shows through as blue, pink or purple, with or without puffiness.
• Structure. No pigment at all — a shadow thrown by the tear trough, by loss of fat under the eye, by prominent orbital bone or by a lower lid bag.
• Post-inflammatory pigmentation. Darkening left behind by atopic or allergic contact dermatitis, or by months of rubbing.

Reviews add periorbital edema and skin laxity to the list of contributing factors. The full classification, and the simple test that separates shadow from pigment, is in types of dark circles.

What the research actually supports

A 2025 cross-sectional study of 116 patients with periorbital hyperpigmentation tested the usual suspects against severity. Family history was significantly associated. So were stress, prolonged sun exposure, hormonal pills and several underlying conditions including anemia. The authors singled out two factors as key: rubbing the eyes and prolonged screen exposure. Sun and family history had already been established by earlier work, and this study agreed with it.

Sleep: real, but smaller than the folklore

The same 2025 study found sleep quality was not significantly related to severity, which the authors flagged as surprising. That does not mean a bad night has no effect on how you look. A controlled experiment published in SLEEP photographed ten people after normal sleep and again after 31 hours of sleep deprivation, and independent observers rated the deprived faces as having darker circles under the eyes, along with hanging eyelids, redder eyes, more swollen eyes and paler skin.

The distinction is worth holding onto. Sleep loss visibly darkens the eye area in the short term. Chronic dark circles that are already established are a different problem, and catching up on sleep does not resolve them. The habit-versus-inheritance question is worked through in are dark circles genetic.

Iron, vitamins and what the searches are really asking

There is no established vitamin deficiency that causes dark circles. What the literature does show is an association with anemia, which fits the mechanism: fewer red cells means paler skin, and paler skin makes the underlying vasculature more visible. If circles appeared recently and arrive with fatigue, breathlessness or general pallor, a blood count is a reasonable request. Buying a supplement on the strength of the circles alone is not.

In children the leading suspect changes

Under-eye darkening in a child is most often allergic shiners. StatPearls lists dark circles under the eyes among the physical findings of allergic rhinitis, a condition that affects roughly one in six people and is one of the most common chronic disorders of childhood. The darkening comes from venous congestion in the infraorbital groove, not from pigment. This is covered in dark circles in children.

When to see someone

Circles that appear suddenly, worsen quickly, affect one side only, or come with swelling, fatigue or weight change deserve medical assessment rather than a concealer. For circles that are long-standing and simply unwanted, the options that match each mechanism are in how to reduce dark circles.

This content is informational and does not replace consultation with a dermatologist.