What Causes Sunken Temples and How to Fix Them

Sunken temples result from the gradual loss of fat and muscle in the region between the eye and the hairline, a process driven mainly by aging but accelerated by weight loss, certain medications, and medical conditions. The temple area is more vulnerable to hollowing than most parts of the face because it depends on a thin stack of soft tissue layers over bone, and when any of those layers shrink, the concavity becomes visible quickly. Fixes range from injectable fillers and fat grafting to surgical reconstruction, depending on how severe the hollowing is and what caused it.

Why the Temple Is Prone to Hollowing

The temple sits over the temporal fossa, a shallow depression in the skull. Unlike the cheeks or jawline, which have thick pads of fat and robust bone structure supporting them, the temple is filled by a relatively modest combination of soft tissues. Imaging studies have identified five distinct layers in this region: a connective tissue layer, a superficial fat pad, a deep fat pad, the temporalis muscle, and a layer right against the bone itself.1PubMed. Imaging the temporal fossa The temporalis muscle, the large fan-shaped muscle you can feel contract when you clench your jaw, accounts for less than half the total soft tissue thickness in this area. The rest comes from fat pads and connective tissue.2PubMed. The superficial temporal fat pad and its ramifications for temporalis muscle construction in facial approximation That means the temple’s fullness depends heavily on fat that can shrink, and muscle that can atrophy. Lose volume in either layer and the bone underneath starts to show through as a visible hollow.

Aging and the Slow Drain of Volume

For most people, sunken temples are simply part of getting older. Both the fat pads and the temporalis muscle thin out over the decades. A ten-year CT study tracking these changes found that temporalis muscle thickness dropped by roughly a quarter over a decade, shrinking by about 0.15 mm per year. Muscle volume fell from around 20 cubic centimeters to about 16, a loss of nearly 20 percent.3PubMed Central. Long-term Outcomes of Temporal Hollowing Augmentation by Targeted Volume Restoration of Fat Compartments in Chinese Adults The losses were larger and more variable in the temporalis than in other facial muscles like the masseter at the jawline, which helps explain why the temples hollow out faster and more visibly than the lower face.

Fat loss compounds the problem. The superficial temporal fat pad, a structure that sits between the skin and the muscle and gives the temple its smooth, slightly convex appearance in youth, gradually deflates. Ultrasound studies in adults have confirmed that skin thickness, the fat layers beneath it, and the muscle all vary at different depths and positions across the temple, and all of these structures change with age.4Book of Abstract Conference Proceeding of The International Halal Science and Technology Conference 2024 (IHSATEC): 17th Halal Science Industry and Business (HASIB). The Anatomy Study of the Facial Temporal Region, Age 25-50, in Thai Population Based on Ultrasound Investigation The result is a progressive hollowing that most people begin to notice in their late thirties or forties, though the timeline varies widely with genetics, body composition, and lifestyle.

Medical and Drug-Related Causes

Aging is the most common cause, but it is not the only one. Several medical conditions and medications can hollow out the temples earlier or more dramatically than normal aging would.

Understanding the cause matters because it shapes which treatment makes sense. Hollowing from normal aging tends to be gradual and bilateral, while drug-related or surgical hollowing can be sudden, deeper, or affect only one side.

Hyaluronic Acid Fillers

Injectable hyaluronic acid (HA) is one of the most common fixes for mild to moderate temple hollowing. The gel is placed between the layers of fascia in the temple, where it adds immediate volume. A systematic review and meta-analysis of studies using this approach found an overall effectiveness rate of about 85 percent, with higher efficacy when about 1.5 mL was injected per side and when an 18-gauge cannula was used instead of a needle.10PubMed Central. Filler Injection Between the Superficial and Deep Temporal Fascia and Diameter of Superficial Temporal Arteries for Temple Augmentation: A Systematic Review and Meta‐Analysis Results are visible immediately and typically last somewhere between nine months and two years, depending on the product used and how quickly your body metabolizes it.

HA fillers have one major practical advantage: they are reversible. An enzyme called hyaluronidase can dissolve the filler if the result looks wrong or if a complication arises. That reversibility is particularly important in the temple, which has anatomical features that make filler injections riskier than in some other facial areas.

Biostimulatory Injectables

Rather than simply filling space the way HA does, biostimulatory products like poly-L-lactic acid (PLLA) work by triggering your body to produce new collagen over several months. The injected material gradually breaks down, but the collagen it stimulates remains, creating a more natural-feeling restoration that can last two years or longer. A randomized controlled trial found that nearly all treated participants, about 97 percent, achieved a meaningful improvement in temple hollowness by six months, with the results holding through twelve months of follow-up and high satisfaction rates.11PubMed Central. Efficacy and Safety of a Poly-L-Lactic Acid Filler for Temporal Augmentation: A Randomized, No-treatment Control, Evaluator-blinded, Multicenter Study

PLLA has become a popular option for people experiencing facial volume loss from GLP-1 weight-loss drugs. Because these medications cause diffuse fat loss rather than localized hollowing, the collagen-building effect of a biostimulatory product can address both the volume deficit and the skin laxity that comes with it. Clinicians treating GLP-1 users have reported good outcomes combining PLLA with HA fillers, using the biostimulator for broad volumization and the HA for precise contouring.12PubMed Central. 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 The tradeoff is that PLLA results are not immediate: you typically need two or three sessions spaced weeks apart, and the full effect builds gradually. Unlike HA, PLLA is also not reversible, so precision during injection matters even more.

Fat Grafting for Longer-Lasting Correction

For people with more pronounced hollowing or those who want a solution that does not require repeated office visits, autologous fat grafting is an option. The procedure harvests fat from somewhere on your body (often the abdomen or thighs), processes it, and injects it into the temple’s fat compartments. Because the injected material is your own tissue, the body does not treat it as foreign, and the fat that survives the transfer becomes a permanent part of the temple.

The catch is that not all of the transferred fat survives. A study of long-term outcomes in Chinese adults found that the average volume needed per temple was about 12 mL, and the fat graft survival rate was roughly 66 percent, meaning about a third of the injected volume was reabsorbed over time. Despite that, over 90 percent of temples showed meaningful improvement in hollowness, and more than 90 percent of patients were satisfied with the results.3PubMed Central. Long-term Outcomes of Temporal Hollowing Augmentation by Targeted Volume Restoration of Fat Compartments in Chinese Adults To account for the expected reabsorption, surgeons usually overfill slightly. Some patients need a second round of grafting months later if the initial transfer does not survive well enough.

Fat grafting requires a more involved procedure than office-based injections: it typically involves local anesthesia or sedation, a recovery period with swelling, and a longer wait to see the final contour. But for deep hollowing, especially from surgical or medical causes, it can produce results that fillers alone cannot match.

Surgical Reconstruction

The most aggressive treatment is reserved for severe hollowing, usually after neurosurgery. When a craniectomy and bone replacement leave a persistent soft tissue defect, injectable fillers may not provide enough volume, and fat grafting may not have enough supporting structure to work well. In these cases, surgeons can use a muscle flap, most commonly the serratus anterior muscle from the side of the chest, transferred to the temple and shaped to fill the defect.

A study of this technique found that the flap procedure took about 100 to 150 minutes, all flaps survived, and there was almost no muscle atrophy or resorption over the follow-up period, so the restored contour held.13PubMed Central. Correction of Temporal Hollowing Deformity Using Serratus Anterior Muscle Flap This is clearly not a procedure for someone bothered by mild age-related hollowing, but for post-surgical patients, it can restore facial symmetry that no other approach can.

Why Temple Fillers Carry Unique Risks

The temple is one of the higher-risk areas for filler injection, and that risk deserves its own discussion. The region contains the superficial temporal artery and, deeper down, the deep temporal artery. These arteries have connections, called anastomoses, to the blood vessels that supply the eye. A cadaver study identified four distinct pathways through which filler material injected into the deep temporal artery could travel into the ophthalmic artery, potentially blocking blood flow to the retina or the muscles that move the eye.14PubMed. Risk of Blindness From Temple Filler Injections: Investigating Vascular Anastomoses Between the Deep Temporal and Ophthalmic Arteries

These are not just theoretical risks. Case reports have documented complications including acute ophthalmoplegia, a sudden inability to move the eye, following HA filler injections in the temple.15PubMed Central. Recovery of Acute Ophthalmoplegia after Hyaluronic Acid Filler Injections to the Temples: A Case Report and Review of the Literature Vision loss, though rare, is the most feared complication and has been reported with temple injections across multiple filler types. The risk is lower with cannulas than with sharp needles, and lower when filler is placed in the correct fascial plane rather than too deep. Expert guidance emphasizes an anatomy-based approach, selecting the injection plane based on individual anatomy and using techniques like retrograde fanning with a cannula to spread the filler evenly while minimizing the chance of entering a blood vessel.16PubMed Central. An Expert Guide to Anatomy-Based Filler Injection for the Temple: Techniques and Clinical Insights

None of this means temple filler is inherently dangerous, but it does mean the procedure demands an injector who understands the vascular anatomy of the area intimately. The meta-analysis finding that cannula use was associated with the highest effectiveness also aligns with the safety rationale: cannulas are blunt-tipped, so they tend to push blood vessels aside rather than puncture them.10PubMed Central. Filler Injection Between the Superficial and Deep Temporal Fascia and Diameter of Superficial Temporal Arteries for Temple Augmentation: A Systematic Review and Meta‐Analysis

Can Non-Invasive Treatments Help

People sometimes wonder whether skin-tightening technologies like microfocused ultrasound or radiofrequency devices can address temple hollowing. These devices work by heating deeper skin layers to stimulate collagen remodeling, producing a mild tightening effect. Studies of microfocused ultrasound show that roughly 60 to 90 percent of patients see facial improvement six months after treatment.17PubMed. Microfocused Ultrasound for Skin Tightening However, the improvement is in skin laxity, not in deep volume. If your temples are hollow because the fat and muscle underneath have shrunk, tightening the skin over an empty space will not fill it in. These technologies are better suited as complements to volume restoration rather than standalone treatments for hollowing.

How Clinicians Assess Severity

If you are considering treatment, your provider will likely classify the severity of your hollowing using some form of visual scale. A systematic review of the literature found that visual analogue scales are the most commonly used method for grading temporal hollowing, with most systems running from no visible concavity to severe hollowing with visible bone outline.18PubMed. Temporal hollowing causes, classifications, and treatment options: A systematic review More advanced practices use 3D imaging to measure volume loss precisely, which helps plan how much filler or fat is needed and track results over time.3PubMed Central. Long-term Outcomes of Temporal Hollowing Augmentation by Targeted Volume Restoration of Fat Compartments in Chinese Adults

Mild hollowing, the kind most people notice in their forties, usually responds well to a single session of HA filler or a course of biostimulator injections. Moderate hollowing may benefit from fat grafting or higher volumes of injectable product. Severe cases, particularly post-surgical ones, often need a layered approach: structural reconstruction first, then refinement with fillers or fat.

The GLP-1 Weight-Loss Connection

The rise of semaglutide and tirzepatide for weight management has created a new population of patients seeking temple restoration. These drugs work well for their intended purpose, but the face loses fat right alongside the rest of the body. The temples, with their thin layer of padding, are often among the first areas where loss becomes obvious. What makes GLP-1-related facial hollowing different from normal aging is the speed. Losing 15 to 20 percent of body weight over a year strips facial fat much faster than aging would, and the skin does not have time to contract around the smaller underlying structures, so you get hollowing plus loose skin at the same time.

Early clinical data on treating these patients suggest that combining biostimulatory injectables like PLLA with HA fillers addresses both problems simultaneously: the PLLA stimulates collagen to improve skin quality and create gradual volume, while the HA provides immediate structural support in the deepest hollows.12PubMed Central. 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 A case series from Latin America confirmed this combination approach effectively corrected skin laxity, volume loss, and wrinkles in people who had lost weight on GLP-1 drugs, with a good safety profile.7PubMed Central. Aesthetic Use of Poly-L-Lactic Acid and Hyaluronic Acid Fillers in Medication-Driven Weight Loss Due to GLP-1 Receptor Agonists: Real-World Case Series from Latin America If you are on one of these medications and noticing facial changes, addressing the temples early, before the hollowing becomes severe, tends to produce more natural results than waiting.

When Hollowing Affects Only One Side

Bilateral temple hollowing is the norm with aging and weight loss, but asymmetric or one-sided hollowing can point to something different. Post-surgical patients frequently have hollowing confined to the operative side. Localized corticosteroid injections can cause a dent at the injection site without affecting the opposite temple. And rarely, conditions that cause wasting of the temporalis muscle on one side, such as nerve damage or certain autoimmune conditions, can produce unilateral hollowing.

Treating asymmetry is trickier than treating bilateral hollowing because the goal is not just to add volume but to match the untreated side precisely. Small differences in projection, contour, and surface texture are easy to spot when the other temple serves as a direct comparison. Providers managing asymmetric cases tend to use multiple small sessions, adjusting as swelling resolves and the injected material settles, rather than trying to achieve a perfect match in a single visit.