Periorbital hyperpigmentation, the clinical term for dark circles around the eyes, is one of the most common cosmetic complaints worldwide, and it almost never has a single cause. Most people assume the darkness comes from pigment in the skin, but the most frequently identified type is actually vascular, caused by blood vessels showing through the thin skin around the eyes. Genetics, allergies, aging, and structural changes in the face all play overlapping roles, which is why dark circles can be so stubborn to treat.
Not One Condition but Several
Dermatologists have moved toward classifying dark circles into distinct subtypes rather than treating them as a single problem. The major categories include the vascular type, where blood vessels become visible beneath the skin; the constitutional or pigmentary type, where there is genuinely more melanin in the skin; postinflammatory hyperpigmentation, which follows conditions like eczema or contact dermatitis; and shadow-effect dark circles, caused by structural features like tear troughs or loose skin creating the illusion of darkness.
In a study of patients in Singapore, the vascular type was the most common at about 42%, followed by the constitutional type at roughly 39%, postinflammatory at 12%, and shadow effects at 11%.1PubMed. Periorbital hyperpigmentation in Asians: an epidemiologic study and a proposed classification A separate assessment found the vascular type even more dominant at 51%, with the purely pigmentary type accounting for only about 6%.2PubMed. Classification and characteristics of periorbital hyperpigmentation Most people had darkening involving both the upper and lower eyelids rather than just one area. The key takeaway is that if you look at the spectrum of dark circles across a large group of people, most of what you see is vascular rather than a true pigmentation problem.
Ethnic background matters for which type predominates. Among Chinese participants, the vascular type was more common, while among Indian and Malay participants, the constitutional (melanin-driven) type was the leading cause.3PubMed. Periorbital hyperpigmentation in Asians: an epidemiologic study and a proposed classification This variation has practical implications for treatment: a lightening cream designed to reduce pigment will do very little for someone whose dark circles are vascular in nature.
Why Blood Vessels Are the Leading Culprit
The skin around the eyes is the thinnest skin on the face. It sits directly over the orbicularis oculi muscle, and the blood vessels within and beneath that muscle can show through as a bluish or purplish discoloration.4PubMed. Infraorbital dark circles: definition, causes, and treatment options When blood pools in this network of vessels, or when the skin becomes even slightly thinner with age or dehydration, the contrast between the darker vascular color and the surrounding skin intensifies.
This is why dark circles can look worse when you are tired, hungover, or dehydrated, even if no permanent change has occurred in your skin. Anything that dilates blood vessels or slows blood flow in the area can temporarily amplify the appearance. Conversely, anything that thickens or plumps the skin, even temporarily, tends to reduce the visible darkness. The mechanism is more about what you are seeing through the skin than what is happening in the skin itself.
The Genetic Factor
If your parents have dark circles, you probably do too. In a study of 200 patients with periorbital hyperpigmentation, 63% had a positive family history.5PubMed Central. Periorbital Hyperpigmentation: A Study of its Prevalence, Common Causative Factors and its Association with Personal Habits and Other Disorders Among those with the constitutional (pigment-driven) type specifically, the rate was even higher: roughly 77% had a family member with the same condition. The pattern has been described as an autosomal dominant trait, meaning you only need to inherit it from one parent for it to show up.
Even for the vascular type, genetics plays a role. About 63% of patients with vascular-type dark circles in the same study had a positive family history, which makes sense when you consider that skin thickness and translucency around the eyes are inherited characteristics.6PubMed Central. Periorbital Hyperpigmentation: A Study of its Prevalence, Common Causative Factors and its Association with Personal Habits and Other Disorders Some researchers have proposed that periorbital melanosis is actually an extension of a normal pigmentary demarcation line on the face, with melanin deposited in the upper dermis rather than the surface layer of skin.7PubMed. Periorbital melanosis is an extension of pigmentary demarcation line-F on face If this is correct, it reframes the pigmentary type of dark circles not as a disorder but as a variation of a normal skin feature, just more pronounced in some families.
Allergies and the “Allergic Shiner”
Pediatricians have long recognized a clinical sign called the “allergic shiner,” the dark, sometimes slightly puffy discoloration beneath the eyes of children with nasal allergies. Research has confirmed that these circles are measurably darker and larger in children with allergic rhinitis compared to those without.8PubMed. Quantitative assessment of allergic shiners in children with allergic rhinitis
The mechanism is thought to involve chronic nasal congestion. When the nasal passages swell, they impede venous drainage from the area around the eyes, causing blood to pool in the small vessels beneath the lower eyelids. This is one reason dark circles in allergy sufferers tend to improve when their allergies are treated. Postinflammatory hyperpigmentation from atopic dermatitis or allergic contact dermatitis around the eyes also contributes. If you chronically rub itchy eyes, the repeated friction can darken the skin over time through an entirely separate mechanism.9PubMed Central. Periorbital Hyperpigmentation: A Comprehensive Review
Sleep Deprivation and Other Lifestyle Factors
Everyone “knows” that poor sleep causes dark circles, but the evidence for this is weaker than you might expect. One study that directly measured the skin’s light reflectance after sleep deprivation found no statistically significant change in darkness under the eyes, though there was a trend in that direction. The researchers did find decreased blood flow in the under-eye area, which could contribute to a pooling effect that worsens vascular-type circles.10Journal of Cosmetics, Dermatological Sciences and Applications. The Effects of Sleep Deprivation on the Biophysical Properties of Facial Skin
The honest picture is that poor sleep probably makes existing dark circles look worse, particularly the vascular type, by affecting blood flow and causing mild fluid retention. But sleep deprivation is unlikely to create dark circles where the underlying anatomy does not already favor them. If you have genetically thin skin and prominent blood vessels beneath your eyes, a bad night will make that more visible. If you do not, you might look tired in other ways, but the dramatic undereye darkening people fear is less about sleep alone than about the structural and genetic cards you were dealt.
A case-control study did find that people with periorbital darkening reported worse sleep quality overall, but the relationship is tangled: the researchers also found that simply having dark circles negatively affected quality of life, and psychological distress from appearance concerns can itself disrupt sleep.11PubMed. The influence of sleep quality on the development of periocular hyperchromia: a case-control study Teasing apart cause and effect is difficult here. Other commonly cited lifestyle factors, such as alcohol, smoking, and screen time, remain plausible contributors but lack strong controlled data specifically for periorbital hyperpigmentation.
How Aging Changes the Picture
For many people, dark circles that were mild in their twenties become more noticeable by their forties and fifties. This is driven less by changes in pigmentation and more by structural shifts in the face. As fat pads around the eye socket thin and descend, the transition between the lower eyelid and the cheek becomes more pronounced, creating what is known as a tear trough deformity. This groove catches light in a way that casts a shadow, giving a sunken, fatigued appearance that resists cosmetic concealment.12PubMed Central. Dermal Fillers for the Treatment of Tear Trough Deformity: A Review of Anatomy, Treatment Techniques, and their Outcomes
Simultaneously, skin laxity increases, the under-eye skin becomes even thinner, and collagen loss makes blood vessels more visible.13Annals of Dermatology. Treatments of Infra-Orbital Dark Circles by Various Etiologies In some cases, fat behind the eyeball herniates forward, creating a bag that casts its own shadow. These age-related changes mean that dark circles in older adults are frequently a combination of vascular visibility, shadow effects, and mild pigmentary change all at once, which is why single treatments often fall short.14PubMed. Infraorbital dark circles: definition, causes, and treatment options
Topical Treatments and Their Limits
The topical products marketed for dark circles generally target the pigmentary component. Hydroquinone, kojic acid, azelaic acid, and retinoids are the most commonly used depigmenting agents, though much of their evidence base comes from studies on melasma (a broader facial pigmentation condition) rather than periorbital hyperpigmentation specifically.15PubMed Central. Periorbital Hyperpigmentation: A Comprehensive Review
In head-to-head testing for pigment reduction, kojic acid and hydroquinone performed similarly: about half of patients responded equally to both, while roughly 28% responded better to kojic acid and 21% to hydroquinone. The difference was not statistically significant, though the kojic acid formulation was more irritating.16PubMed. The combination of glycolic acid and hydroquinone or kojic acid for the treatment of melasma and related conditions A formulation combining vitamin C, vitamin A, and vitamin E applied for eight weeks showed measurable improvement in skin lightness and melanin levels compared to placebo in patients with mixed-type dark circles.17PubMed. Classification by causes of dark circles and appropriate evaluation method of dark circles
The practical issue is that these agents work on melanin, so they are only helpful for the pigmentary component. If your dark circles are primarily vascular or structural, a depigmenting cream will not address the underlying cause. The periorbital skin is also more sensitive and thinner than the rest of the face, so irritation from active ingredients is a real concern. Hydroquinone in particular requires careful use and is restricted or banned for over-the-counter sale in some countries due to concerns about long-term side effects. Retinoids can help thicken the skin slightly over months of use, which has a secondary benefit for vascular-type circles by making blood vessels less visible, but the effect is modest.
Procedural Options
For people who want more than topical products can deliver, several in-office procedures have shown effectiveness for dark circles, though matching the procedure to the cause remains essential.
Chemical peels, carboxytherapy (injection of carbon dioxide gas under the skin to stimulate circulation), and mesotherapy (microinjection of vitamins and other agents) have all been shown to reduce periorbital pigmentation.18PubMed. Treatment of periorbital dark circles: Comparative study of carboxy therapy vs chemical peeling vs mesotherapy Among light-based therapies, intense pulsed light and ruby laser have produced some of the most promising results for pigmentation, especially when combined with depigmenting topical agents. For patients who also want skin tightening and wrinkle reduction around the eyes, CO2 and Er:YSGG lasers have shown more benefit, while Nd:YAG and alexandrite lasers have produced more moderate results when used alone.19Archivos de la Sociedad Española de OftalmologÃa (English Edition). Treatment of periorbital hyperpigmentation using light devices
Platelet-rich plasma (PRP), where a concentrated portion of your own blood is injected into the treatment area, has emerged as another option. A meta-analysis of randomized trials found that patients treated with PRP reported higher satisfaction than those receiving placebo or alternative treatments like mesotherapy.20Archives of Dermatological Research. Rejuvenating the periorbital area using platelet-rich plasma: a systematic review and meta-analysis Patients typically received about three sessions spaced a few weeks apart. The evidence is still limited to relatively small studies, but PRP has the appeal of using the patient’s own biological material, which carries a lower risk of allergic reaction.
For shadow-type dark circles driven by a deep tear trough, dermal fillers injected along the groove can reduce the shadowed appearance. This approach addresses the structural cause directly rather than trying to change the skin’s color. The results are immediate but temporary, typically lasting several months to over a year depending on the filler material used.21PubMed Central. Dermal Fillers for the Treatment of Tear Trough Deformity: A Review of Anatomy, Treatment Techniques, and their Outcomes The under-eye area is an advanced injection zone with risks including bruising, asymmetry, and the Tyndall effect (a bluish discoloration from filler placed too superficially), so practitioner experience matters here more than in many other filler locations.
The Emotional Impact
Dark circles are often dismissed as a purely cosmetic concern, but the research suggests they carry real emotional weight. Studies consistently find that periorbital hyperpigmentation negatively affects quality of life, and the degree of dissatisfaction tracks directly with how severe the darkening is.22PubMed. Association between clinical characteristics, quality of life, and sleep quality in patients with periorbital hyperchromia In one case-control study, people with dark circles scored roughly twice as high on a quality-of-life impact questionnaire compared to controls without the condition.23PubMed. The influence of sleep quality on the development of periocular hyperchromia: a case-control study
Part of what makes dark circles psychologically burdensome is the social misattribution. People read dark under-eye circles as signals of exhaustion, illness, aging, or unhealthy habits, and they do so automatically and often incorrectly. If your dark circles are genetic, vascular, or structural, no amount of sleep or healthy living will eliminate them, yet you may still field comments about looking tired from colleagues and acquaintances. The gap between what dark circles signal to others and what actually causes them is genuinely frustrating for people who deal with it daily.
Cosmetic Camouflage That Actually Works
For many people, day-to-day management comes down to makeup. The standard approach uses a color-correcting concealer beneath a setting powder. For bluish or purplish circles (vascular type), peach or orange-toned correctors neutralize the cool tones before a skin-matched concealer goes on top. For brownish circles (pigmentary type), yellow or gold correctors tend to work better. Light-reflecting formulas can further minimize the shadowed appearance.
Placement matters as much as product choice. Concealer applied to the hollowed or shadowed areas, rather than on any puffy skin, gives the best result. Applying product to a bag or puffed area can actually draw attention to it by catching light in the wrong place. A thin layer of translucent powder set over the concealer prevents the product from settling into fine lines, which is a particular concern in the delicate under-eye area where creasing happens quickly.
Sunscreen deserves mention here as well. Ultraviolet exposure can worsen melanin-driven periorbital hyperpigmentation over time, and the thin skin around the eyes is especially vulnerable. A broad-spectrum sunscreen or mineral sunscreen formulated for the eye area, combined with sunglasses, offers a simple and evidence-consistent step for slowing pigmentary darkening. It will not help with vascular or structural causes, but for anyone with a melanin component to their dark circles, consistent sun protection is one of the few genuinely preventive measures available.
Why Treatment Often Disappoints
The central problem with treating dark circles is that most people have more than one contributing factor. Someone might have genetically thin skin (making vessels visible), mild allergic congestion (worsening vascular pooling), an early tear trough (adding shadow), and a modest increase in melanin. No single treatment addresses all of those simultaneously. A peel or lightening cream might reduce the pigmentary component by a visible margin but leave the vascular and structural components untouched, leading the patient to feel that the treatment “didn’t work” when it actually addressed only one layer of a multi-layer problem.
This is why dermatologists who specialize in periorbital hyperpigmentation emphasize identifying the dominant cause before choosing a treatment. Pulling the lower eyelid skin taut and looking at how the color changes is one quick clinical test: if the darkness disappears when the skin is stretched, the cause is likely structural shadowing; if the color changes from dark to more reddish-purple, vessels are the main contributor; if the dark color stays put regardless, melanin deposition is the primary driver. Combination approaches, using a topical retinoid for skin thickening alongside a laser for pigment or a filler for volume loss, tend to produce more noticeable results than any single modality.24PubMed. Infraorbital dark circles: definition, causes, and treatment options Managing expectations is part of the process: meaningful improvement is realistic, but complete elimination of dark circles is rare when multiple factors are at play.