What causes dark circles — and why most eye creams do not fix them.

Dark circles are one of the most commonly searched skincare concerns, and one of the most frequently misunderstood. They are not a single condition with a single cause — they are a collection of visible presentations that look similar but arise from different mechanisms. A product formulated to address one mechanism will have limited effect on another.

Understanding which type is present is the prerequisite for choosing anything that actually helps.

Three distinct mechanisms

Vascular dark circles. Blue, purple, or pink-toned shadow beneath the eyes. The cause is visibility of blood vessels through thin periorbital skin and subcutaneous fat. The skin around the eye is the thinnest on the face — in some people, the underlying vasculature is visible as a result.

Contributing factors include genetics (thin skin and translucency are largely inherited), fatigue (vasodilation), and dehydration (reduced subcutaneous volume). Cold temperatures cause vasoconstriction and can temporarily reduce their appearance.

Structural dark circles. This presents as a shadow rather than a discolouration — a hollowing effect caused by the tear trough (the groove between the lower eyelid and the cheek) becoming more pronounced. It is primarily an effect of the orbital fat pad gradually shifting with age, creating a shadow that the eye reads as darkness. It worsens with volume loss in the midface.

Structural dark circles have no topical treatment. The shadow is geometric — it is created by the contour of the face, not by pigmentation or vascularity. Fillers or fat transfer to the tear trough area address the structural cause; topicals do not.

Pigment dark circles. Brown, grey, or darker-toned discolouration that does not change with sleep or hydration. True melanin hyperpigmentation in the periorbital skin — most prevalent in East Asian, South Asian, Middle Eastern, and African skin tones, where baseline melanocytic activity is higher. UV exposure, genetics, and repeated trauma (rubbing the eyes) are the main contributors.

Pigment dark circles respond to the same actives used for other forms of hyperpigmentation: vitamin C, niacinamide, azelaic acid, and — on the face — SPF.

Why most people have more than one type

The eye area is affected by all three mechanisms simultaneously in most adults over thirty. Volume loss contributes a structural shadow; vascular visibility produces a bluish undertone; sun exposure and genetics add a pigment component. The mix varies by individual and skin tone.

This is why the results of most eye creams are inconsistent. A product with caffeine and vitamin K addresses the vascular component. A product with vitamin C and niacinamide addresses the pigment component. Neither addresses the structural component, and neither addresses all three simultaneously. The expectation that one eye cream will resolve "dark circles" assumes all dark circles are the same problem.

What actually helps

For vascular dark circles: Caffeine constricts blood vessels temporarily, reducing the appearance of bluish vascular shadows for a few hours. It is well-established as a cosmetic treatment — it works by vasoconstriction, not through any permanent mechanism. Cold compresses or chilled metal tools produce the same effect through the same pathway. Sleep and hydration improve the condition when fatigue and dehydration are contributing factors. Topical retinol, used consistently over months, thickens periorbital skin gradually — this is one of the few mechanisms with potential to address the underlying cause over time, though the evidence in this specific application is less robust than its evidence for other uses.

For structural dark circles: Topicals have no meaningful effect. If the cause is tear trough hollowing, the only treatments that address the cause are volumising — hyaluronic acid filler, fat transfer, or surgical correction. A good SPF routine prevents further volume-degrading photoageing.

For pigment dark circles: SPF is the most important intervention — daily broad-spectrum protection on the periorbital area prevents further UV-driven pigment. Vitamin C (10–15% in a stable formulation) and niacinamide (4–5%) address existing pigment over weeks to months. Azelaic acid is well tolerated in the periorbital area. Eye formulations exist for all of these, but the regular face serum applied carefully is often as effective.

The practical framework

Identify the undertone of the dark circles as a starting point for identifying the dominant mechanism. Bluish-purple suggests vascular; shadow-only without discolouration suggests structural; brown or grey-toned suggests pigment. Most presentations involve all three in different proportions.

For any pigment component: SPF plus a brightening active (vitamin C, niacinamide, or azelaic acid) applied consistently for three to four months.

For the vascular component: caffeine-containing eye product or cold application for temporary improvement; retinol long-term if tolerated.

For the structural component: accept that topicals will not address the cause. Consider whether the hollow is significant enough to warrant a consultation with a cosmetic physician.

Consistent basics — sleep, hydration, and daily SPF in the periorbital area — are more useful than any single eye cream. They address the factors that can be addressed. The structural and genetic components cannot be changed with topicals, and setting that expectation clearly is more useful than chasing the next eye serum.