A sunken face usually results from the loss or redistribution of fat, bone, and soft tissue beneath the skin. The most common cause is simple aging, which quietly remodels the facial skeleton, shrinks key fat pads, and thins the skin over decades. But rapid weight loss, certain medications, dental changes, and a handful of medical conditions can all accelerate or mimic the process, sometimes making a person look years older than they are. The good news is that most causes are identifiable, and several effective treatments exist depending on what is driving the hollowing.
How Aging Reshapes the Face From the Inside Out
Most people think of facial aging as a surface problem: wrinkles, sagging skin, maybe some sun damage. The reality is that the changes start deep, at the level of bone. The facial skeleton does not simply stay put while the soft tissue above it deteriorates. It actively remodels throughout life, and the direction of that remodeling tends to work against you. The eye sockets widen as their rims gradually resorb, with the lower-outer rim receding first during middle age and the upper-inner rim following later in life.1PubMed Central. Changes in the Facial Skeleton With Aging: Implications and Clinical Applications in Facial Rejuvenation That widening is part of why the eyes look more hollow and deep-set over time. Meanwhile, the midface retrudes: the maxilla (the bone forming the upper jaw and cheek foundation) loses projection, with the maxillary angle decreasing by roughly ten degrees between young and older adults.1PubMed Central. Changes in the Facial Skeleton With Aging: Implications and Clinical Applications in Facial Rejuvenation The jawbone loses height and develops areas of relative concavity that contribute to jowling.
Layered on top of that skeletal retreat are changes to the facial fat pads. The face has distinct compartments of fat, both superficial and deep, and they do not all age at the same rate. A 3D MRI study tracking facial fat across age groups found that the buccal fat pad (the deep pad that gives cheeks their fullness) shrank proportionally with age, as did the fat along the nasolabial fold. Interestingly, superficial fat in the upper face stayed relatively stable, while infraorbital fat actually increased significantly, which helps explain why under-eye bags tend to become more prominent even as the cheeks flatten.2PubMed Central. Study on Age-Related Facial Fat Changes Using 3D MRI and a Novel Algorithm – Section: RESULTS This uneven pattern of fat loss and gain is a big part of why an aging face does not just look smaller; it looks reshaped.
The skin and muscles contribute too. Collagen production slows, elastin degrades, muscle tone diminishes, and the skin itself thins and loses its ability to drape tightly over the structures beneath it.3PubMed Central. The Facial Aging Process From the “Inside Out” When you combine bone recession, selective fat loss, and thinning skin, the result is a face that looks progressively more hollowed at the temples, cheeks, and around the eyes. Because these deep structural changes happen gradually and invisibly, many people do not notice the hollowing until it crosses some threshold of visibility and suddenly feels dramatic.
Weight Loss and the “Ozempic Face” Phenomenon
Losing a significant amount of weight, whether through diet, exercise, or medication, will almost always change the face. Your body does not get to choose where it pulls fat from, and the face is not exempt. What has drawn particular attention recently is the facial hollowing associated with GLP-1 receptor agonist drugs like semaglutide and tirzepatide. The popular term “Ozempic face” describes the gaunt, aged look that can develop after moderate medication-assisted weight loss, even when total body weight loss is well under massive-weight-loss thresholds.
A systematic review of the literature on GLP-1 drugs and facial changes found that the fat loss affects several regions, including the temples, cheeks, tear troughs, jawline, and the folds around the mouth. These drugs also appear to reduce collagen and elastin levels, compounding the effect. The combination of a thinner fat layer and less resilient skin makes the face look older than the person’s actual age. The review noted that these effects are more pronounced in older patients who already have lower baseline collagen, and it found no strong evidence that GLP-1 drugs preferentially target facial fat. The likely explanation is simpler: the drugs cause overall fat loss, and the face just shows it more because there was not much padding there to begin with.4PubMed Central. “Ozempic Face” in Plastic Surgery: A Systematic Review of the Literature on GLP-1 Receptor Agonist Mediated Weight Loss and Analysis of Public Perceptions
Imaging data puts some numbers on this. A radiographic study of patients on GLP-1 drugs found a median decrease of about 9% in total midfacial volume, with superficial fat dropping around 11%. Superficial volume loss correlated with the amount of weight lost, at roughly 7% facial volume reduction for every 10 kilograms shed, while deep facial volume loss was less predictable.5PubMed. Radiographic Midfacial Volume Changes in Patients on GLP-1 Agonists So the hollowing is real and measurable, though it follows overall weight loss rather than being some unique drug side effect.
This applies beyond medication-assisted weight loss. Any substantial caloric deficit, whether from crash dieting or extreme endurance activity, pulls from both fat and lean tissue. A case study of a cyclist during an extreme endurance race documented loss of nearly 800 grams of fat mass alongside more than a kilogram of fat-free mass over the course of the event, demonstrating how the body draws from subcutaneous fat and muscle alike under severe energy deficit.6PubMed Central. Effects of an extreme endurance race on energy balance and body composition – a case study Over time, chronic caloric restriction or yo-yo dieting can strip facial fullness in a way that is difficult to recover naturally.
Tooth Loss and Bone Resorption in the Jaw
One of the most overlooked causes of a sunken face is tooth loss. When a tooth is extracted, the bone that once supported it begins to resorb. The body does not maintain bone where there is no functional demand, so the alveolar ridge, the bony shelf that holds the teeth, gradually shrinks. Research on extraction sites has shown that this bone loss is most pronounced in the outer (buccal) wall and occurs at both premolar and molar locations, with molar sites losing more bone.7PubMed. Modeling of the buccal and lingual bone walls of fresh extraction sites following implant installation
When multiple teeth are lost, especially in the upper jaw, the cumulative bone loss can dramatically reduce the structural support for the lower face. The lips lose their scaffold, the cheeks collapse inward, and the chin-to-nose distance shrinks. This is why people who have been edentulous (without teeth) for years often have a distinctly sunken, collapsed appearance around the mouth. Dentures sit on top of the gums and do not prevent this bone resorption; in fact, the pressure of dentures can accelerate it. Dental implants are one of the few interventions that can slow or halt alveolar bone loss because they provide the mechanical stimulation that bone needs to maintain itself.
Medications That Thin the Face
Beyond GLP-1 drugs and weight loss, a few other medications can cause localized or generalized facial hollowing. Corticosteroid injections, commonly used for joint pain, skin conditions, and soft tissue inflammation, can cause fat atrophy at or near the injection site. Corticosteroids suppress collagen production and inhibit fat cell metabolism, and when injected too superficially into subcutaneous tissue rather than the intended deeper plane, they can create a visible depression or sunken spot that persists for months.
A less well-known culprit is the class of glaucoma eye drops called prostaglandin analogs, including travoprost and bimatoprost. These drops are used daily to lower eye pressure, but they can cause progressive fat loss around the eye sockets, a condition called prostaglandin-associated periorbitopathy. The result is deepening of the upper eyelid crease and a sunken, hollow-eyed appearance.8PubMed. Latanoprost therapy after sunken eyes caused by travoprost or bimatoprost The effect can be measurable: one study found that the distance between the pupils shortened significantly after treatment with prostaglandin analogs, reflecting the inward shift of orbital tissue, with bimatoprost producing a greater effect than other drugs in the class.9PubMed. Shortening of Interpupillary Distance after Instillation of Topical Prostaglandin Analog Eye Drops If you use glaucoma drops and have noticed your eyes looking more hollowed, it is worth discussing with your ophthalmologist; switching to a different drug class can sometimes reverse the change.
Medical Conditions That Cause Facial Wasting
Several diseases can cause more dramatic facial hollowing than aging alone. HIV-associated lipodystrophy is one of the most recognized. Both the virus itself and some of the antiretroviral drugs used to treat it can trigger inflammation in subcutaneous fat tissue, leading to a striking loss of facial fat, particularly in the cheeks and temples.10PubMed Central. Acquired facial lipoatrophy: A report of 3 cases with imaging features The metabolic abnormalities associated with this condition share features with inherited lipodystrophies and involve disruption at the cellular level, including mitochondrial dysfunction triggered by certain drug classes.11PubMed. Lipodystrophy syndrome in HIV infection: what is it, what causes it and how can it be managed? Modern antiretroviral regimens have reduced the incidence, but facial lipoatrophy remains a concern for long-term patients on older drug protocols.
Autoimmune conditions can also be responsible. Lupus erythematosus and localized scleroderma both involve inflammatory destruction of subcutaneous fat, a process called panniculitis, which can lead to visible facial wasting.10PubMed Central. Acquired facial lipoatrophy: A report of 3 cases with imaging features Parry-Romberg syndrome is a rarer condition in which one side of the face progressively wastes away, affecting the skin, subcutaneous fat, muscle, and sometimes even the bone. The severity ranges from mild asymmetry that is barely noticeable to severe disfigurement, and the atrophy is typically self-limiting, meaning it eventually stops progressing on its own.12EMJ Dermatology. Progressive Facial Haemiatrophy (Parry–Romberg Syndrome) Treated with Hyaluronic Acid Fillers
Cachexia, the wasting syndrome associated with serious illness like cancer, heart failure, or chronic obstructive pulmonary disease, also produces facial hollowing as part of a whole-body process. Unlike simple weight loss, cachexia involves the breakdown of muscle tissue driven by the disease itself, and it often cannot be fully reversed by eating more. The facial wasting it produces is just one visible marker of a systemic problem.13PubMed Central. Sarcopenia, cachexia and aging: diagnosis, mechanisms and therapeutic options – a mini-review
Sun Damage, Dehydration, and Other Lifestyle Factors
Ultraviolet light exposure accelerates the breakdown of the collagen matrix in the skin, which is the structural scaffolding that keeps skin firm and plump.14Dermatologic Surgery. Aging in the Male Face: Intrinsic and Extrinsic Factors – Section: Ultraviolet Light Exposure Years of sun exposure do not directly destroy facial fat, but the resulting thin, lax, crepey skin makes underlying volume loss far more visible. Two people with the same amount of age-related fat loss can look very different depending on how much sun damage they have accumulated. Smoking produces a similar effect through its own collagen-degrading pathways.
Dehydration is sometimes blamed for a sunken face, and there is a kernel of truth here, but it is more nuanced than social media suggests. Acute dehydration can make the face look temporarily drawn, particularly around the eyes. However, clinical research on dehydration signs has actually found that sunken eyes and dry mouth are not reliable indicators of dehydration severity, at least in children.15The Lancet. Clinical signs of dehydration in children Chronic mild dehydration is unlikely to be the primary cause of persistent facial hollowing. If your face has become noticeably sunken over weeks or months, drinking more water is not going to fix it; the cause is almost certainly structural rather than fluid-related.
Treatments for Facial Volume Restoration
The range of solutions depends on the cause, the severity, and what you are willing to commit to. Here is what is available, roughly ordered from least invasive to most.
Dermal Fillers
Hyaluronic acid fillers are the most common first-line treatment for mild to moderate facial hollowing. They provide immediate volume when injected into areas like the cheeks, temples, tear troughs, and jawline. Because hyaluronic acid is naturally present in the skin, the body gradually breaks it down, and results typically last six to eighteen months depending on the product and the area treated. For people experiencing volume loss from GLP-1 medications, a combined approach using hyaluronic acid for immediate cheek augmentation alongside poly-L-lactic acid for longer-term collagen stimulation in the lower face has shown improvements in facial definition that lasted through nine months of follow-up.16Aesthetic Surgery Journal. A Multicenter, Open-Label Study of Combined Poly-L-Lactic Acid and Hyaluronic Midface Filler Regimen Enhances Facial Harmony and Skin Quality in GLP-1 Medication Users Poly-L-lactic acid works differently; rather than adding immediate volume, it stimulates your own collagen production over several months, so the results are more gradual but can last two years or more.
Fat Grafting
Autologous fat transfer, in which fat is harvested from another part of your body (commonly the abdomen or thighs) and injected into the face, offers a more lasting solution than temporary fillers. The transplanted fat survives by absorbing nutrients from surrounding tissue in the first couple of days and then gradually integrates with new blood vessel growth.17PubMed Central. A Systemic Review of Autologous Fat Grafting Survival Rate and Related Severe Complications The challenge is that not all transferred fat survives; some is reabsorbed by the body, which is why surgeons often slightly overfill the area initially. Advances in processing techniques, including enrichment with platelet-rich plasma and stem cells from fat tissue, have shown promise in improving how well grafts take and last.18PubMed Central. Maximizing the Longevity and Volume Retention of Fat Grafts: Advances in Clinical Practice
Surgical Options
When volume loss is accompanied by significant skin laxity, fillers and fat grafting alone may not be enough. A deep plane facelift repositions the soft tissue and muscle layer of the face rather than simply pulling the skin tight, which makes it particularly suited for restoring a more youthful facial contour. A review of 136 consecutive deep plane facelift cases found a strong safety profile, with no flap loss, no infections, one hematoma, and only three cases of temporary nerve irritation.19PubMed Central. Systematic Approach to Deep Plane Facelift Facelifts are often combined with fat grafting to address both the sagging and the volume deficit simultaneously. For people whose sunken appearance is driven primarily by bone loss, implants made of solid silicone or porous polyethylene can be placed over the cheekbones, chin, or jawline to restore the underlying skeletal projection.
Skin-Tightening Devices
Radiofrequency devices and ultrasound-based treatments like microfocused ultrasound are marketed for facial rejuvenation and do improve skin laxity and elasticity to a degree.20PubMed. Evaluating the effectiveness and safety of radiofrequency for face and neck rejuvenation: A systematic review However, it is worth setting realistic expectations. These devices work on the skin and superficial tissue layers. They cannot replace lost fat or bone volume. For someone whose sunken face is primarily a skin-quality issue, they can help. For someone with genuine structural volume loss, they are at best complementary to fillers, fat grafting, or surgery, not a substitute.
When Facial Hollowing Calls for a Medical Workup
Most facial sunkenness is the product of aging, weight change, or some combination of the two, and does not signal anything medically worrying. But certain patterns deserve a closer look. Hollowing that appears rapidly, over weeks rather than years, could point to unintentional weight loss from an undiagnosed illness. Facial wasting concentrated on one side raises the possibility of Parry-Romberg syndrome, especially if it progresses steadily in a younger person.21PubMed. Parry-Romberg syndrome: facial atrophy and its relationship with other regions of the body Facial hollowing accompanied by generalized muscle wasting, fatigue, and unintended weight loss warrants screening for cachexia-causing conditions.13PubMed Central. Sarcopenia, cachexia and aging: diagnosis, mechanisms and therapeutic options – a mini-review And if you are on antiretroviral therapy and notice your cheeks and temples thinning, the lipodystrophy pattern is well-recognized and your HIV specialist can assess whether adjusting your regimen would help.
For everyone else, the practical question is whether the hollowing bothers you enough to treat, and if so, which approach fits your budget, your tolerance for downtime, and how long you want results to last. Fillers are the lowest-commitment entry point. Fat grafting offers a more durable but more involved solution. Surgery makes sense when the problem involves significant tissue sagging rather than pure volume loss. And if a specific medication is the culprit, whether it is a glaucoma drop or a corticosteroid, simply switching therapies may be enough to halt or partially reverse the change.