Dark Circles: Four Causes, and Why the Fix Depends on Yours

Dark circles have four common causes: pigment sitting in the skin, blood vessels showing through skin that is thin, shadow cast by the shape of the eye socket, and a mix of the three. Each one answers to something different. Most under-eye products target only one, which is why the same product works for one person and does nothing for the next.

The useful first step is not shopping. It is figuring out which kind you have.

What causes dark circles under the eyes?

Clinical reviews sort under-eye darkness by mechanism, not by how dark it looks. A 2009 review in Dermatologic Surgery named three contributors: excess pigmentation, thin and translucent lower eyelid skin lying over the orbicularis oculi muscle, and shadowing from skin laxity and the tear trough (PMID 19469797).

Later work kept that structure and added detail. A 2021 systematic review in Dermatologic Surgery grouped causes as pigmentary, structural, vascular, and mixed (PMID 32740208). An evidence-based review published in the Journal of Cosmetic and Laser Therapy split the pigmented group further into constitutional, idiopathic, and post-inflammatory, alongside vascular and shadowing types (PMID 34078228).

One point repeats across the literature. Most people do not have a single clean cause. The 2009 review concluded that multiple factors are at work in the majority of patients. A 2015 review in Clinics in Plastic Surgery made the same observation, noting that an individual patient may carry more than one underlying cause (PMID 25440739).

The four mechanisms at a glance

Type	What it tends to look like	Stretch test	Light test	What it answers to
Pigmented	Brown or grey-brown, often extends past the lid onto the orbital rim	Color stays with the skin	Barely changes	Pigment-directed topicals, sun protection, procedures
Vascular	Blue, purple, or pink, worse when tired or congested	Color may shift or fade as skin flattens	Barely changes	Vessel-directed procedures, sleep and allergy factors
Structural shadow	Darkness follows a groove or hollow, skin color itself looks normal	Darkness reduces as the trough flattens	Changes a lot with light angle	Volume, not cream
Mixed	Two or three of the above together	Partial change	Partial change	Whichever component dominates, in order

The stretch test and the light test

Clinicians use structured versions of both. A study of 200 patients attending a dermatology outpatient clinic in India, published in the Indian Journal of Dermatology, used an eyelid stretch test plus Wood's lamp examination. The Wood's lamp classified the pigment as dermal in 60.5% of cases (PMID 24700933). Dermoscopy adds another layer. Among 100 patients examined with a video dermatoscope at an Indian tertiary care center, dilated veins appeared in 50% and telangiectasia in 32% (PMID 33544960).

Both cohorts describe the patients who walked into those clinics. The proportions are not population figures for a different country or a different mix of skin tones.

You cannot do a Wood's lamp exam at home. You can do rough versions of the two mechanical tests, which is enough to point you in a direction.

How to do the stretch test

Face a mirror in even light. Place a fingertip on the cheekbone below the darkest part. Pull the skin gently outward and downward so the under-eye skin goes taut and the hollow flattens.

Watch what the darkness does. If the color travels with the skin and stays about as dark, pigment in the skin is likely part of the picture. If the darkness largely disappears once the groove flattens, you are looking at shadow. If the color shifts tone or lightens partly, a vascular component is likely involved.

How to do the light test

Stand under a ceiling light and look straight ahead. Then hold a phone flashlight at chest height, pointing up at your face, and look again.

Shadow is an optical effect, so it responds to light angle. If the darkness nearly vanishes when lit from below and returns under overhead light, the cause is contour. Pigment and visible vessels are physically in the tissue. They change very little when the light moves.

Neither test is diagnostic. They sort likely from unlikely, which is what most people need before spending money.

Pigmented dark circles, or periorbital hyperpigmentation

This is melanin in the under-eye skin. It usually reads brown or grey-brown rather than blue, and it often continues past the lower lid onto the surrounding orbital skin.

The clinic data gives a sense of how the types divide. In that 200-patient series, the constitutional type accounted for 51.5% of cases and the post-inflammatory type for 22.5%. Patients were 81% female, and the largest age group was 16 to 25 years, at 47.5% of cases (PMID 24700933). The dermoscopy study found a similar ranking, with the constitutional type most common at 43% (PMID 33544960).

Family history came up often in that cohort. Of those 200 patients, 63% reported a family history, and the authors also recorded associations with stress in 71% and atopy in 33% (PMID 24700933). Constitutional pigment that has been there since your teens and runs in your family behaves differently from pigment that arrived after months of rubbing itchy eyes.

Post-inflammatory pigment is the version most worth catching early, because the input is often ongoing. Frequent eye rubbing was reported by 32.5% of patients in that series, and frequent cosmetic use by 36.5% (PMID 24700933). The dermoscopy study found an exaggerated pigment network to be the most frequent pattern in the post-inflammatory type (PMID 33544960).

Pigment under the eye follows the same broad rules as pigment elsewhere on the face. The general playbook in how to fade dark spots applies, with the caveat that eyelid skin is thinner and more reactive. For how this sits against other pigment patterns, see melasma versus hyperpigmentation. Two ingredient discussions cover the wider literature on facial pigment: high percentage niacinamide and tranexamic acid in skincare. Neither of those is about the under-eye area.

The systematic review found topical creams and chemical peels useful for pigment-based cases, while noting that the overall evidence base is thin and recommendations should be read selectively (PMID 32740208). Daily sun protection is the unglamorous part, and skipping it undoes slow gains.

Vascular dark circles: thin skin over vessels

Lower eyelid skin is among the thinnest on the body. The 2009 review described thin and translucent lower eyelid skin over the orbicularis oculi muscle as a distinct contributor to darkness (PMID 19469797). What you see through it is the muscle and the vascular bed underneath.

The color reads blue or purple rather than brown, and it tends to fluctuate. Poor sleep, crying, and nasal congestion can all make it look worse on a given morning.

Dermoscopy backs up how common the vascular contribution is. Dilated veins were seen in half of the 100 patients examined, and telangiectasia in about a third (PMID 33544960). Skin also thins with age, which makes an existing vascular component more visible over time. The general mechanics of that thinning are covered in the science of skin aging and wrinkles.

The under-eye area is thin, mobile, and close to the eye itself, so it is handled differently from the rest of the face in every context. The anatomy and the cautions specific to that zone are covered separately in microneedling under the eyes.

On treatment, the systematic review rated lasers as mildly to moderately beneficial for both vascular and pigment types (PMID 32740208). That is a modest verdict, and it is worth taking at face value rather than rounding up.

Structural shadow answers to volume, not to cream

This is the part most articles skip, and it is the reason so many people conclude that nothing works.

Structural darkness is not a color in the skin. It is a shadow. The tear trough is a groove that runs from the inner corner of the eye down and outward. When the groove deepens, or when the cheek volume below it descends, overhead light cannot reach the recess. You get a dark crescent even though the skin there is the same color as the rest of your face.

The 2009 review listed shadowing from skin laxity and the tear trough as a cause separate from pigment (PMID 19469797). In the dermoscopy cohort, the shadow effect type was second most common at 32% (PMID 33544960). A 2016 review in the Journal of Cutaneous and Aesthetic Surgery described infraorbital dark circles as the result of deep facial anatomy, soft tissue changes, and contributions from the skin. It concluded that understanding both the deep and superficial anatomy is central to managing them (PMID 27398005).

The treatment evidence follows the same logic. The systematic review concluded that soft tissue fillers and autologous fat grafting are most effective for dark circles caused by volume loss. It found blepharoplasty best when excessive skin laxity is the underlying cause (PMID 32740208). Both are in-office procedures. Neither is a topical.

So the plain version: if your darkness is a shadow, no cream changes the shape of your orbital rim. A brightening serum will not fill a groove. Knowing this in advance saves a year of disappointment. The related loss of structural support elsewhere in the face is covered in what causes sagging skin.

Mixed dark circles are the usual case

Reviews keep landing on the same conclusion. Multiple factors contribute in most patients, which is why cause identification comes before treatment selection (PMID 19469797, PMID 25440739).

Practically, your two tests will often give a partial answer. Some darkness fades when you flatten the skin, some stays. That is normal. The useful move is to rank the components rather than pick one.

Work the reversible inputs first. Then address the dominant mechanism. Then reassess before adding anything else. Fine lines in the same area are a separate problem with a separate answer, covered in under eye wrinkles.

Does sleep actually cause dark circles?

Sleep affects how the area is perceived, and the effect has been measured.

In a study published in Sleep, ten individuals were photographed after normal sleep and again after 31 hours of sleep deprivation that followed a night with five hours of sleep. Forty observers rated the photographs. After deprivation, faces were rated as having darker circles under the eyes, along with more hanging eyelids, redder eyes, more swollen eyes, paler skin, and more fine lines. Effects across the affected cues ranged from about 3 to 15 mm on 100 mm visual analog scales, all at P less than 0.01 (PMID 23997369).

That study measured how people looked to observers, not melanin levels. It supports a real and visible effect. It does not mean sleep loss created the underlying pigment.

Self-reported habits line up with this. In the 200-patient series, 40% reported inadequate sleep, and 12% had uncorrected refractive error such as myopia (PMID 24700933). These are associations reported by patients in one clinic population, not proven causes. Still, sleep, eye rubbing, and an outdated glasses prescription are cheap to address, and they are the only levers that cost nothing.

How to get rid of dark circles: matching the fix to the cause

Order of operations beats product selection.

Start with the reversible inputs. Sleep, allergy and congestion management with a clinician, less eye rubbing, current vision correction, and daily sun protection. Give this a couple of months before judging anything else, since these inputs also determine whether new pigment keeps arriving.

Then treat the dominant mechanism. Pigment responds slowly to topicals and to in-office pigment-directed treatments. Vascular darkness has a modest response to laser in the published evidence (PMID 32740208). Structural shadow is a volume and contour question handled by a clinician, or handled with makeup, or accepted.

Concealer deserves more respect than it gets. It is the only same-day option for structural shadow, and it costs a fraction of everything else.

Set expectations on time. Under-eye pigment is often dermal, which was the case in 60.5% of Wood's lamp assessments in that 200-patient study, and dermal pigment is slower to shift than surface pigment (PMID 24700933). Months, not weeks.

When to see a dermatologist

See a board-certified dermatologist if the darkness appeared suddenly, is clearly asymmetric, comes with swelling or pain, or changed after starting a new medication. Also see one if you want a definitive answer on type, since Wood's lamp and dermoscopy sort pigment depth and vascular contribution in ways that a mirror cannot (PMID 24700933, PMID 33544960).

If your under-eye skin is itchy, flaking, or inflamed, treat that with a clinician before adding any active product. Inflammation is one of the documented routes to post-inflammatory pigment in this area (PMID 34078228).

A note on the evidence overall. The 2021 systematic review examined 39 studies and stated plainly that high-quality evidence is scarce, so its own recommendations should be interpreted selectively (PMID 32740208). Anyone promising a guaranteed result for dark circles is ahead of the literature.

FAQ

How do I know if my dark circles are pigment or shadow?

Use the light test. Look at your face under a ceiling light, then with a flashlight held below and pointed up. Shadow depends on light angle and largely disappears when lit from underneath. Pigment sits in the tissue and looks about the same either way. The stretch test adds confirmation: flattening the tear trough reduces shadow but not pigment.

Can any cream fix dark circles caused by shadow?

No. Structural shadow is a contour problem, not a color problem. The systematic review of 39 studies found soft tissue fillers and autologous fat grafting most effective when volume loss is the cause, and blepharoplasty best for excessive skin laxity (PMID 32740208). A topical does not change the depth of a groove.

Are dark circles genetic?

Family history is commonly reported. In a series of 200 patients with periorbital hyperpigmentation at an Indian clinic, 63% reported a family history, and the constitutional type was the most common at 51.5% (PMID 24700933). A separate series of 100 patients also found the constitutional type most common at 43% (PMID 33544960). Facial anatomy also varies between people, and that 2016 review described dark circles as arising from deep facial anatomy, soft tissue changes, and the skin (PMID 27398005).

Why do my dark circles look worse when I am tired?

Because sleep loss changes how the whole eye region reads. In a controlled study, observers rated sleep-deprived faces as having darker under-eye circles plus more swollen eyes, redder eyes, hanging eyelids, and paler skin (PMID 23997369). Pale surrounding skin and puffiness both increase contrast and shadow, so an existing vascular or structural component becomes more obvious.

How long does it take to see any change in dark circles?

It depends entirely on type. Sleep and rubbing-related changes can shift within weeks. Pigment is slower, especially since Wood's lamp assessment classified the pigment as dermal in 60.5% of one 200-patient series (PMID 24700933). Plan in months for pigment. Structural shadow does not fade on its own. The options there are procedural, cosmetic camouflage, or leaving it alone.

Is it worth treating dark circles at all?

That is a personal call. Infraorbital dark circles are generally described in the literature as a cosmetic concern rather than a medical one (PMID 19469797). Identifying your type is worth doing regardless. It tells you whether an approach has a plausible mechanism behind it, or whether you are buying something aimed at a different problem.