Understanding the True Culprit of Dark Circles: Hyperpigmentation vs. Shadowing

This article explores the science behind dark circles, explains how these two primary causes differ, and helps you understand which factors may be contributing to your own concerns. It also outlines when a professional consultation with a qualified aesthetic practitioner may be a sensible next step in your journey.

Whether you are researching treatments, considering a consultation, or simply looking to understand your skin better, this guide offers balanced, evidence-informed information.

Dark circles under the eyes can result from hyperpigmentation — where excess melanin darkens the skin — or from structural shadowing, caused by volume loss, hollowing, or anatomical features that create shade beneath the eye. Correctly identifying the underlying cause is essential, as each requires a different approach to management.

Dark circles refer to the appearance of darkened skin, discolouration, or shadow beneath the lower eyelid. They are among the most prevalent cosmetic concerns across all skin types and age groups, affecting men and women alike.

Despite being commonly associated with tiredness or stress, dark circles are often unrelated to sleep. In many cases, they are the result of underlying skin biology, facial anatomy, or natural ageing processes. Understanding this is the first step towards addressing them effectively.

Clinically, dark circles are broadly categorised into several types:

• Pigmented or vascular dark circles — related to melanin or visible blood vessels beneath thin periorbital skin
• Structural or shadow-based dark circles — related to hollowing, skin laxity, or prominent tear troughs
• Mixed dark circles — a combination of both pigmentation and structural causes

The periorbital area — the skin surrounding the eyes — is among the thinnest and most delicate on the face, making it particularly susceptible to both intrinsic and extrinsic ageing. This anatomical sensitivity is why the under-eye area tends to show signs of change earlier than other facial zones.

Hyperpigmentation occurs when the skin produces excess melanin, the pigment responsible for skin, hair, and eye colour. In the periorbital area, this can manifest as a brownish or greyish discolouration that is present regardless of lighting conditions or head position.

Several factors contribute to periorbital hyperpigmentation:

• Genetic predisposition — many individuals, particularly those with naturally darker skin tones (Fitzpatrick types IV–VI), are genetically inclined to produce more melanin in the periorbital region
• Post-inflammatory hyperpigmentation — allergic reactions, eczema, frequent rubbing, or skin irritation can trigger localised melanin overproduction
• Sun exposure — ultraviolet (UV) radiation stimulates melanocytes, the cells responsible for melanin production, potentially darkening existing pigmentation
• Vascular pigmentation — oxidised haemoglobin from small blood vessels visible through thin skin can create a bluish or purplish tint, sometimes classified as a subtype of pigmentation-related dark circles

A useful clinical test to differentiate pigmentation from shadowing is the stretch test: gently stretching the skin under the eye. If the discolouration persists when the skin is stretched, pigmentation is likely a contributing factor. If the darkening diminishes, structural shadowing is more probable.

Skincare ingredients commonly studied for periorbital hyperpigmentation include vitamin C, niacinamide, kojic acid, and retinoids — though their effectiveness varies considerably between individuals.

Structural or shadow-based dark circles are not caused by excess pigment in the skin but by the three-dimensional shape of the face and the effects of facial ageing on volume and tissue distribution.

As we age, several changes occur simultaneously in the midface and periorbital region:

• Volume loss in the fat compartments beneath and around the eye creates a hollow or sunken appearance
• The tear trough — a groove that runs from the inner corner of the eye towards the cheek — becomes more pronounced as supporting fat and tissue diminish
• Skin laxity increases as collagen and elastin production decline, causing skin to thin and drape less smoothly over the orbital rim
• Bony remodelling of the orbital rim and midface can alter the contour of the under-eye area

The resulting hollow or concavity casts a shadow beneath the lower eyelid in natural lighting conditions. Critically, this shadow can be identical in appearance to pigmentation-based dark circles, yet its cause and optimal approach to management are entirely different.

Structural dark circles tend to worsen progressively with age, can be influenced by body weight changes (including significant weight loss that affects facial fat), and are often more pronounced in individuals with deep-set eyes or prominent orbital rims.

Understanding this structural component is central to informing appropriate treatment planning.

The under-eye area is a particularly dynamic region affected by the natural biological processes of skin ageing. To understand why dark circles evolve over time, it helps to appreciate what is happening at a cellular and structural level.

Collagen is the primary structural protein in skin, providing firmness and resilience. From our mid-twenties onwards, collagen production begins to decline at a rate of approximately 1% per year. In the delicate periorbital skin — which starts at approximately 0.5mm in thickness compared to 2mm elsewhere — this loss becomes visible earlier and more prominently.

Elastin, the protein responsible for skin's ability to spring back into shape, also degrades over time. Reduced elastin contributes to the fine crepey texture that often appears beneath the eyes.

Hyaluronic acid, a naturally occurring molecule that binds water and maintains skin hydration and volume, decreases in concentration as we age. Its reduction contributes to the deflation and hollowing seen in the tear trough region.

Facial fat compartments that provide structural support and smooth contours also redistribute and reduce in volume with age. The loss of the sub-orbicularis oculi fat (SOOF) and infraorbital fat pads is particularly relevant to the formation of structural shadow beneath the eyes.

Together, these biological changes explain why dark circles caused by shadowing become more prevalent and more pronounced as we age — even in individuals who did not experience them significantly in younger years.

One of the most important messages for anyone researching dark circle treatments is this: not all dark circles are the same, and they should not all be approached in the same way.

Treatments that target pigmentation — such as certain topical agents, chemical peels, or laser-based interventions — may offer little benefit for structural shadowing. Conversely, volumising approaches that address hollowing may have limited effect on true hyperpigmentation.

In clinical practice, a qualified aesthetic practitioner will typically conduct a thorough periorbital assessment that considers:

• Skin tone and Fitzpatrick classification
• Degree of pigmentation versus visible hollowing
• Skin quality, thickness, and hydration
• Presence and depth of the tear trough
• Relevant medical and lifestyle history
• Anatomical features including orbital rim prominence and eye position

This assessment informs a tailored treatment plan, which may involve a single modality or a combination of approaches depending on the individual's concerns and anatomy.

For those with mixed dark circles — both pigmentation and structural components — a phased or combination approach may be considered, though this will always depend on professional assessment.

While specific treatment recommendations require individual consultation, it is helpful to understand the broad categories of approaches that practitioners may discuss in the context of periorbital concerns.

For Pigmentation-Related Dark Circles

• Topical skincare — formulations containing vitamin C, tranexamic acid, niacinamide, or retinoids may help gradually reduce melanin production with consistent use over time
• Chemical peels — superficial peels targeting pigmentation may be appropriate for certain skin types, with careful consideration of skin tone and risk of post-inflammatory hyperpigmentation
• Laser and energy-based treatments — selected laser modalities can target melanin, though these require careful selection based on skin type
• Sun protection — daily broad-spectrum SPF application is fundamental to preventing UV-driven pigmentation worsening

For Structural Shadowing

• Polynucleotide (PDRN) treatments — biostimulatory injectables that support tissue regeneration and improve skin quality in the periorbital area; polynucleotide treatments at Pantaleo are offered as part of a personalised treatment approach
• Skin booster injections — hyaluronic acid-based hydrating injectables that improve skin quality and fine texture in the periorbital region
• Tear trough filler — carefully placed dermal filler in the tear trough region to address hollowing and restore volume, reducing structural shadow; this approach requires significant clinical expertise and careful patient selection
• Collagen-stimulating treatments — certain aesthetic interventions, such as PRP therapy, stimulate the skin's own collagen production over time, gradually improving structural support

Treatment suitability varies considerably between individuals, and not all approaches are appropriate for all patients.

A professional consultation with a qualified aesthetic practitioner may be worth considering if you:

• Have persistent dark circles that do not improve with rest, hydration, or topical products
• Notice a hollow or sunken appearance beneath the eyes that worsens in certain lighting
• Are unsure whether your dark circles are primarily pigmentation-based or structural in nature
• Are considering aesthetic treatments and wish to understand your options
• Have noticed progressive changes in the under-eye area over time
• Have previously tried skincare products without achieving satisfactory results

A consultation is not a commitment to treatment. It is an opportunity to receive an informed, professional assessment of your individual anatomy and skin biology, and to understand what approaches — if any — may be appropriate for you.

At Pantaleo Clinic in London, consultations are conducted by experienced practitioners who take a patient-centred, evidence-informed approach to aesthetic assessment.

It is important to emphasise that dark circles do not require treatment, and the decision to pursue any aesthetic intervention should be made freely, without pressure, and based on accurate information.

Understanding what any approach can and cannot realistically achieve is essential before making decisions about aesthetic treatments.

Potential Benefits

• A more rested or refreshed appearance in the periorbital region
• Improvement in skin quality and hydration in the under-eye area
• Reduction in visible hollowing or structural shadow where volume loss is a contributing factor
• Gradual lightening of pigmentation with appropriate skincare or clinical treatments over time

Realistic Limitations

• No treatment can permanently eliminate all dark circles for all patients
• Results vary considerably between individuals based on anatomy, skin type, age, and lifestyle
• Pigmentation dark circles can be particularly challenging to treat and may require prolonged, consistent management
• Structural changes related to significant ageing or pronounced anatomy may respond only partially to non-surgical interventions
• Some patients may not be suitable candidates for certain treatments following clinical assessment

Factors That Influence Outcomes

• Fitzpatrick skin type and melanin production tendencies
• Degree and depth of the tear trough
• Overall skin quality and thickness
• Lifestyle factors including sun exposure, diet, hydration, and sleep
• Consistency with aftercare and maintenance

Individual results cannot be predicted or guaranteed. All treatment outcomes should be discussed realistically during a professional consultation.

Whether or not you pursue aesthetic treatment, maintaining the health of the delicate periorbital skin is beneficial. The following general guidance is widely supported within dermatological and aesthetic practice:

Sun protection — Daily application of a broad-spectrum SPF 30 or higher is one of the most evidence-supported steps for protecting periorbital skin from UV-driven pigmentation and collagen degradation. Look for formulations suitable for sensitive or delicate skin.

Gentle skincare — The periorbital area is prone to irritation. Avoid rubbing or tugging when removing eye makeup, and choose gentle, fragrance-free formulations for the eye contour.

Targeted topical ingredients — Vitamin C (in stable formulations), niacinamide, and retinoids (used carefully and introduced gradually) are among the most studied ingredients for periorbital skin health. Always introduce new active ingredients slowly and patch test first.

Hydration — Adequate daily water intake supports overall skin health, though it is not a standalone solution for dark circles.

Adequate sleep and stress management — While these factors are not the primary cause of dark circles in most cases, they can influence the appearance of puffiness and skin vitality.

Allergy management — If nasal allergies or hay fever contribute to periorbital inflammation or rubbing, addressing these with appropriate medical guidance may help reduce post-inflammatory pigmentation over time.

If you are receiving professional aesthetic treatments in the periorbital region, always follow the specific aftercare advice provided by your treating practitioner, as this will be tailored to the modality used.

• Dark circles have more than one cause. Hyperpigmentation and structural shadowing are distinct, and correctly identifying your type matters.
• A stretch test can help. If discolouration persists when the under-eye skin is gently stretched, pigmentation may be a factor; if it reduces, structure is likely involved.
• Skin biology plays a central role. Age-related collagen loss, volume reduction, and elastin decline all contribute to evolving periorbital changes.
• Skincare alone may not be sufficient. For structural causes of dark circles, topical products have limited impact; professional assessment can clarify what may help.
• Individual variation is significant. No single treatment approach is appropriate for everyone; suitability requires professional evaluation.
• Dark circles do not need to be 'fixed'. Any decision to pursue treatment should be personal, informed, and pressure-free.

Dark circles under the eyes are one of the most nuanced aesthetic concerns in clinical practice, precisely because their causes are so varied. Understanding the difference between dark circles caused by hyperpigmentation and those caused by structural shadowing is not merely academic — it is the foundation of any meaningful, effective approach to management.

From the role of melanin and UV exposure to the progressive effects of collagen loss, volume depletion, and tear trough development, the periorbital region reflects a complex interplay of biology, anatomy, and lifestyle. No single product or treatment addresses all of these factors simultaneously, and what works for one person may be entirely unsuitable for another.

The most important first step for anyone seeking to address their dark circles meaningfully is accurate identification of the contributing cause — and this requires professional assessment, not guesswork.

Treatment suitability, risks, and expected outcomes should always be assessed individually during a professional consultation.

If you have been researching your options and feel ready to seek a personalised evaluation, booking a consultation at Pantaleo Clinic is a straightforward next step towards understanding what may be appropriate for your individual concerns.