Why Do Under-Eye Hollows Develop With Age? Understanding Facial Anatomy

One of the most common concerns patients raise when researching facial ageing is the gradual development of a shadowed, hollowed appearance beneath the eyes. Often described as looking tired, drawn, or older than one feels, under-eye hollows — clinically referred to as tear trough deformity — are a natural part of facial ageing that many people notice earlier than expected.

People frequently turn to online research to understand why this change happens, whether it is something that can be addressed, and what options might be available to them. The desire to look refreshed rather than fatigued is an entirely understandable and legitimate concern.

For a deeper clinical overview focused specifically on treatment planning in this region, this guide on structural tear trough management without puffy overfilling is a useful companion read.

This article explores the anatomy behind under-eye hollows, explains the biological processes that contribute to their development, discusses realistic expectations around aesthetic approaches, and highlights when a professional consultation may be a helpful next step. Understanding the causes is always the first step towards making informed decisions about your skin health.

Under-eye hollows develop due to a combination of age-related changes in facial anatomy — including loss of volume in the fat compartments beneath the eyes, reduced bone density, weakening of supporting ligaments, declining collagen levels, and thinning skin. These structural changes create a shadowed, hollowed appearance in the tear trough region.

The area beneath the eye — commonly called the tear trough — is the curved groove that runs from the inner corner of the eye along the junction between the lower eyelid and the upper cheek. In youth, a smooth and supported transition exists between the lower lid and the cheek, giving the face a full, rested appearance.

As the face ages, this transition becomes more defined and shadowed. The skin in this region is among the thinnest on the body, typically measuring less than 0.5mm in depth, which makes it particularly susceptible to changes in underlying tissue volume, hydration, and structural support.

When the fat compartments beneath the eye reduce in volume, the overlying skin loses its scaffolding. Light no longer reflects evenly across the surface, and a shadow is cast in the hollowed area. This creates the characteristic tired or aged appearance that many patients find distressing, even when they are well-rested.

It is important to understand that under-eye hollowing is a structural and anatomical process — not simply a consequence of fatigue or lifestyle, though those factors can influence its visibility.

Understanding why under-eye hollows develop requires a basic knowledge of the anatomical structures involved. The tear trough is formed at the boundary between the orbicularis oculi muscle — the muscle that surrounds the eye socket — and the upper cheek.

Several distinct anatomical layers are relevant here:

Orbital fat pads: Beneath the lower eyelid sit compartments of fat that cushion the eye. With age, the septum (a thin membrane holding these fat pads in place) weakens, allowing fat to prolapse forward or redistribute, creating puffiness above the tear trough and hollowing below it.

Suborbicularis oculi fat (SOOF): Beneath the orbicularis muscle sits a deeper fat compartment. Volume loss in this layer contributes significantly to mid-face deflation and the accentuation of the tear trough.

The orbitomalar ligament: This retaining ligament anchors the lower lid soft tissues to the orbital rim. As it lengthens with age, it creates the visible groove we recognise as the tear trough.

Facial bones: The orbital rim and maxilla (cheekbone) undergo resorption with age, reducing the bony support for overlying soft tissue structures.

Each of these layers contributes in its own way to the development of under-eye hollows.

Facial ageing is a multi-dimensional process involving changes across every anatomical layer — from bone to skin. Understanding the science helps patients appreciate why topical skincare alone often has limited impact on structural hollowing.

Collagen and elastin decline: From our mid-twenties onwards, collagen production slows by approximately 1% per year. Collagen provides the structural framework of the skin, while elastin maintains its flexibility. As both decline, skin becomes thinner, less resilient, and less able to compensate for volume loss beneath it.

Hyaluronic acid depletion: Hyaluronic acid is a naturally occurring molecule within the skin and soft tissue that attracts and retains water, providing hydration and plumpness. With age, both the quantity and quality of hyaluronic acid in the skin decreases, contributing to reduced tissue volume and diminished skin quality.

Facial fat compartment atrophy: The face contains multiple discrete fat compartments that age independently. Volume loss in the periorbital (around the eye) and mid-face fat compartments directly contributes to under-eye hollowing.

Bone resorption: The facial skeleton is not static. The orbital aperture (the eye socket opening) widens with age, reducing bony support for the overlying soft tissues. The maxilla recedes, further contributing to mid-face deflation.

Gravitational descent: Ligaments and retaining structures gradually lengthen over time, allowing soft tissue to descend. This redistribution of volume from the upper mid-face into the lower face accentuates hollowing beneath the eyes.

These changes occur simultaneously and influence one another, making facial ageing a complex and highly individual process.

Whilst ageing is the primary driver of tear trough hollowing, several additional factors can influence how early and how prominently these changes appear:

Genetics: Facial structure, skin thickness, and the rate of age-related volume loss are significantly influenced by genetics. Some individuals may notice hollowing in their late twenties or early thirties, whilst others may not observe significant change until their fifties.

Body weight fluctuations: Significant weight loss can accelerate the appearance of facial volume loss, as fat compartments throughout the face reduce alongside body fat reduction.

Sun exposure: Chronic UV exposure accelerates the breakdown of collagen and elastin within the skin, contributing to skin thinning and reduced structural support.

Sleep quality and fluid retention: Whilst not a cause of structural hollowing, poor sleep and fluid retention can affect the appearance of the under-eye area through their influence on skin tone, puffiness, and circulation.

Lifestyle factors: Smoking, excessive alcohol consumption, chronic dehydration, and high levels of psychological stress can all contribute to accelerated skin ageing and reduced tissue quality.

Ethnicity and skin type: The depth of the tear trough and the transparency of the overlying skin varies considerably across different skin types and ethnicities, influencing how prominently hollowing is perceived.

For many patients, under-eye hollows are not simply a cosmetic concern — they affect confidence, self-perception, and social interactions. Repeatedly being asked whether they are tired or unwell when they feel perfectly healthy is a common experience for those affected.

It is worth noting that the tear trough region is one of the most complex areas of the face from an anatomical and treatment planning perspective. The overlying skin is exceptionally thin, the underlying anatomy is intricate, and the visual impact of changes in this area is significant due to its central position on the face.

Any approach to addressing under-eye hollows — whether through skincare, lifestyle changes, or aesthetic procedures — should be grounded in a thorough understanding of the individual's anatomy, skin quality, and specific concerns. This is why professional assessment is so important in this particular region.

For patients in the early stages of tear trough development, or those who wish to optimise their skin quality in the periorbital region, certain skincare strategies can play a supportive role — though it is important to maintain realistic expectations about what topical products can and cannot achieve.

Retinoids: Vitamin A derivatives (retinoids) are among the most evidence-supported ingredients for stimulating collagen production and improving skin thickness and texture. Used consistently over time, they may help maintain skin quality in the under-eye area, though formulations must be appropriate for this sensitive zone.

Vitamin C: A stable topical vitamin C serum can support collagen synthesis and provide antioxidant protection against UV-induced damage.

SPF protection: Daily broad-spectrum sun protection is one of the most important steps in preserving skin quality and slowing the rate of collagen degradation.

Eye creams with peptides and hyaluronic acid: Whilst these cannot replace lost structural volume, they may support hydration, skin barrier function, and temporary plumpness in the area.

Adequate hydration and nutrition: A diet rich in antioxidants, alongside adequate water intake, supports overall skin health and tissue quality.

Skincare can meaningfully support skin quality but cannot replace lost structural volume or reverse changes in the underlying anatomy. For more significant structural hollowing, a professional assessment is advisable.

There is no obligation for anyone to pursue aesthetic treatment for under-eye hollows. Many people choose to understand the cause of the change and feel reassured that it is a normal part of ageing. However, a professional consultation may be a helpful and informative step for those who:

Have noticed a progressively hollowed or shadowed appearance beneath the eyes Feel that their under-eye appearance does not reflect how rested or well they feel Are uncertain about whether their concerns relate to structural volume loss, skin quality, or other factors Wish to explore the range of evidence-informed options available to them Have tried skincare approaches without achieving the improvement they were hoping for Are considering an aesthetic procedure and wish to understand the options, risks, and realistic outcomes before making any decisions

A consultation with a qualified medical aesthetic practitioner provides the opportunity for an individualised anatomical assessment. This is the appropriate starting point for understanding what is contributing to your specific concerns and what — if anything — may be suitable for you.

At Pantaleo Clinic in London, initial consultations are designed to be educational, patient-centred, and free from any pressure to proceed with treatment. You can learn more about our facial aesthetic consultation process to understand what to expect.

For patients who have undergone a professional assessment and been deemed suitable for treatment, several aesthetic approaches may be discussed. It is important to emphasise that treatment suitability depends entirely on individual anatomy, skin quality, and health history — not all options are appropriate for all patients.

Tear trough filler (hyaluronic acid dermal filler): One of the most frequently discussed options for under-eye hollowing is the careful placement of hyaluronic acid dermal filler in the tear trough region. When performed by an experienced practitioner with a thorough understanding of periorbital anatomy, this approach may help restore volume and reduce the appearance of shadowing. This is a technically demanding procedure that requires careful patient selection and expert anatomical knowledge.

Polynucleotide (PDRN) treatments: Polynucleotide injections work by stimulating tissue regeneration and improving skin quality from within. They may be considered as part of a treatment plan for skin quality improvements in the periorbital region. You can explore how polynucleotide treatments work for skin rejuvenation on our treatment pages.

Profhilo and bioremodelling treatments: Bioremodelling injectables such as Profhilo contain high concentrations of hyaluronic acid designed to improve skin laxity, hydration, and overall tissue quality. Whilst not specifically a volumising treatment for the tear trough, they may complement other approaches as part of a broader skin health plan.

Skincare optimisation programmes: In some cases, a practitioner may recommend an optimised skincare protocol as a first step or adjunct to other approaches, particularly to improve the overall quality and resilience of the skin.

No treatment option is suitable for everyone, and the decision to proceed should always be made following a thorough, unhurried consultation.

Patients considering any approach to under-eye hollows should be well-informed about both the potential benefits and the realistic limitations.

Potential benefits (where clinically appropriate): Improvement in the appearance of hollowing and shadowing beneath the eyes A more rested and refreshed facial appearance Improved skin quality and hydration in the periorbital region Restoration of a smoother transition between the lower lid and cheek

Realistic expectations: Results are typically subtle and gradual — the goal is natural improvement, not transformation Individual outcomes vary depending on anatomy, skin quality, age, and lifestyle factors Maintenance may be required over time as ageing continues Not all patients will be suitable candidates for injectable treatments in this region

Limitations and considerations: The tear trough region is anatomically complex and carries specific risks when treated with injectables, including bruising, swelling, the Tyndall effect (bluish discolouration from superficially placed filler), and in rare cases, more serious vascular complications If you are specifically researching this complication profile, this article on the Tyndall effect and correcting poorly placed under-eye filler explains warning signs and prevention principles. Results are not permanent — hyaluronic acid filler in this region typically lasts 9–18 months, though individual variation applies Patients with significant lower eyelid laxity, prominent orbital fat prolapse, or other structural factors may not achieve optimal results with filler alone and may require assessment by a specialist in oculoplastic or surgical procedures Skincare products, whilst valuable for skin maintenance, cannot replicate the structural changes achieved by volume restoration

For further information on how dermal fillers can be used in facial rejuvenation, our under-eye treatment page provides a detailed educational overview.

For those who have undergone professional treatment in the tear trough region, or for those who simply wish to maintain the health of their periorbital skin, the following aftercare and lifestyle principles are relevant:

Sun protection: Apply a broad-spectrum SPF 30 or higher every morning, including on days with cloud cover. UV exposure is one of the primary accelerators of periorbital skin ageing.

Gentle skincare: The under-eye skin is delicate. Avoid rubbing or pulling at this area and use gentle, fragrance-free products designed for sensitive or periorbital use.

Hydration: Maintain adequate daily fluid intake to support skin hydration from within.

Sleep hygiene: Quality sleep supports skin cell regeneration and reduces the likelihood of fluid retention that can worsen the appearance of the under-eye area.

Diet and nutrition: A balanced diet rich in antioxidants, vitamins C and E, and omega fatty acids supports collagen production and skin integrity.

Avoid smoking: Smoking significantly accelerates skin ageing through multiple mechanisms including vascular restriction and free radical damage.

Follow practitioner instructions: Patients who have undergone injectable treatments should follow all aftercare guidance provided by their practitioner, including avoiding strenuous exercise, saunas, and vigorous massage of the treated area in the immediate post-treatment period.

Under-eye hollows are primarily a structural change caused by age-related volume loss, bone resorption, ligament laxity, and skin thinning — not simply tiredness or poor skincare habits. The tear trough region is anatomically complex, and its appearance is influenced by multiple layers including bone, fat compartments, muscle, and skin. Skincare can support skin quality in the periorbital area but cannot address structural volume loss. Professional assessment is essential before considering any aesthetic treatment in this region, as suitability varies considerably between individuals. Treatment options exist for appropriate candidates, but realistic expectations and a clear understanding of risks and limitations are fundamental to informed decision-making. Lifestyle and skin health habits — including SPF use, hydration, sleep, and nutrition — play a meaningful role in maintaining periorbital skin quality over time.

Can under-eye hollows be prevented?

Whilst the anatomical changes that lead to under-eye hollows are a natural part of ageing and cannot be entirely prevented, certain lifestyle and skincare habits may help slow their progression. Daily broad-spectrum SPF application, consistent use of evidence-supported skincare ingredients such as retinoids and vitamin C, adequate hydration, quality sleep, a balanced diet, and avoiding smoking may all contribute to preserving periorbital skin quality over time. However, genetic predisposition and the natural ageing of facial structures will inevitably play a significant role regardless of prevention strategies.

Is under-eye filler safe?

Tear trough filler is an established aesthetic procedure, but it is considered one of the more technically demanding treatments in facial aesthetics due to the complexity of periorbital anatomy and the proximity to the eye. When performed by a suitably qualified and experienced medical practitioner, the risk profile can be managed appropriately. However, risks include bruising, swelling, the Tyndall effect, lumps, and — in rare cases — serious vascular complications. Thorough assessment of patient suitability and anatomical understanding is essential. This procedure is not appropriate for all patients.

How long does tear trough filler last?

The longevity of hyaluronic acid filler in the tear trough region varies between individuals and depends on factors including the specific product used, the technique of placement, individual metabolism, and lifestyle. In general, results may last approximately 9–18 months before a maintenance treatment may be considered. Some patients find results persist for longer. Individual assessment and follow-up with a qualified practitioner is the appropriate way to monitor results over time.

What is the difference between under-eye bags and under-eye hollows?

These are two distinct concerns, though they can coexist. Under-eye bags typically refer to puffiness or protrusion of the lower eyelid, often caused by the forward prolapse of orbital fat pads as the lower eyelid septum weakens with age. Under-eye hollows, by contrast, refer to a sunken or shadowed depression in the tear trough region, caused by volume loss in the adjacent fat compartments and other structural changes. Some patients present with a combination of both. An accurate assessment by a qualified practitioner is needed to distinguish between the two and identify the most appropriate approach.

Can polynucleotide treatments help with under-eye hollows?

Polynucleotide (PDRN) treatments work by promoting tissue regeneration, improving skin quality, and stimulating the production of collagen and elastin. Whilst they are not a volumising treatment in the same way as hyaluronic acid fillers, they may help improve the quality, texture, and resilience of the skin in the periorbital region. Some practitioners use them as part of a combined approach to periorbital rejuvenation. Suitability depends on individual assessment, and outcomes vary between patients.

At what age do under-eye hollows typically start to develop?

There is no single age at which under-eye hollows develop. Genetic predisposition plays a significant role, and some individuals begin to notice early tear trough changes in their late twenties or early thirties, whilst others may not observe meaningful change until their forties or fifties. Factors such as significant weight loss, sun damage, smoking, and overall health can also influence the timing of changes. A professional consultation can help establish the specific anatomical factors contributing to an individual's concerns at any age.

Under-eye hollows are a natural consequence of the complex, multi-layered changes that occur within the face as we age. Far from being a simple surface concern, the tear trough region reflects the interplay between bone structure, fat compartment volume, ligament integrity, muscle anatomy, and skin quality — all of which evolve throughout life.

Understanding why under-eye hollows develop empowers patients to approach their options thoughtfully and with realistic expectations. Skincare can play a valuable supportive role, but structural changes require structural understanding. Where patients are considering aesthetic treatment, thorough professional assessment is the essential first step.

There is no single solution that is appropriate for everyone, and the range of options available varies considerably depending on individual anatomy, skin quality, and personal goals. Treatment suitability, risks, and expected outcomes should always be assessed individually during a professional consultation.

If you have concerns about under-eye hollows or would like to better understand your options, we would encourage you to seek personalised advice from a qualified medical aesthetic practitioner. At Pantaleo Clinic in London, our approach is grounded in evidence-informed practice, patient education, and individualised care.