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Procedure guide · Face
Facial Asymmetry SurgeryFacial asymmetry surgery corrects a visible difference between the two sides of the face, using whichever combination of procedures the cause requires: bone repositioning, custom implants, fat transfer or soft tissue surgery. Assessment with photographs and a CT scan comes first, because the treatment depends entirely on whether the asymmetry is skeletal, soft tissue or muscular. Surgery takes 60 to 240 minutes and the final result appears at 6 to 12 months.
Every human face is asymmetric. The two sides differ in the size and position of the bones, in the bulk of the muscles, in the distribution of fat and in the thickness of the skin, and the difference is usually large enough to be obvious the moment someone sees a mirrored photograph of themselves. Facial asymmetry becomes a clinical problem not when it exists but when it is visible to other people and troubling to the person who has it. That distinction shapes everything about how it should be treated, because the goal is never symmetry, which does not exist, but a face in which the difference stops being the first thing anyone sees.
The causes divide into groups that need to be distinguished before anything is done, because the treatments have nothing in common. Congenital conditions, of which hemifacial microsomia is the best known, produce a side that has been underdeveloped since birth, affecting bone, soft tissue and sometimes the ear and jaw joint together. Developmental conditions such as condylar hyperplasia, in which one jaw joint continues growing into adulthood, produce an asymmetry that increases over years and deviates the chin progressively. Acquired causes include old facial fractures, childhood muscular torticollis, previous surgery and radiotherapy. And functional causes, chiefly facial nerve weakness, produce asymmetry that is mild at rest and obvious in movement.
This is why assessment matters more than surgery in this field, and why a plan that starts with a proposed procedure rather than with an examination should be treated cautiously. The central question is whether the asymmetry is stable. An asymmetry that has been the same since adolescence can be corrected with confidence. One that has visibly changed in adulthood needs investigating first, usually with a CT scan and sometimes a bone scan to establish whether growth is still active, because correcting a progressive asymmetry surgically means watching it return.
Once the cause is established, the treatment follows from what is actually different. Where the skeleton is deficient on one side but the bite is normal, a custom implant designed from a CT scan is the most precise option: the fuller side can effectively be mirrored onto the flatter one, and the fit is exact rather than approximate. This avoids cutting bone and has a shorter recovery than an osteotomy, at the cost of introducing a permanent implant with the infection risk that carries.
Where the problem is position rather than volume, bone has to be moved. Rotating a deviated chin segment back to the midline is the commonest example and is done through the mouth with no skin scar. Where the whole jaw is deviated and the teeth do not meet correctly, the correct treatment is orthognathic surgery with orthodontic preparation, which repositions the jaws and corrects the bite at the same time. This is a larger undertaking than most patients seeking cosmetic correction expect, and it is the honest recommendation in a meaningful minority of cases.
Where the difference is in soft tissue rather than bone, fat transfer is usually the answer. Fat taken from the abdomen or thigh and injected in fine layers builds up the flatter side, feels natural, carries no implant risk and can be adjusted across sessions rather than committed to at once. Its weakness is predictability: roughly half to two-thirds survives, and the proportion varies, so two or three sessions are common. This is not a complication but a characteristic, and it should be planned and priced as such from the beginning.
Asymmetry that appears only in movement is a different problem again, and structural surgery does not solve it. A face that is level at rest and pulls to one side when smiling usually has either an overactive muscle on one side or a weak one on the other. Botulinum toxin to balance the stronger side is both a treatment and a useful diagnostic test, because it is temporary: if weakening the overactive side improves things, that tells you something a permanent operation could not have told you safely. Established facial nerve weakness is a specialist field of its own, with reanimation procedures that have their own long recoveries.
The emotional course of this surgery deserves specific mention, because it differs from cosmetic surgery generally. The first thing that happens after facial asymmetry surgery is that the asymmetry gets worse: the operated side swells more, and for a fortnight the face is less balanced than it was beforehand. Patients who have not been warned find this genuinely distressing. The sides do not become comparable until 6 to 8 weeks, transferred fat does not reach its final volume until 4 to 6 months, and any planned second stage usually waits until 6 months or later.
Finally, expectations. The most reliable predictor of satisfaction after facial asymmetry surgery is what the patient was told beforehand. Those who were promised symmetry are frequently disappointed by results that objectively improved their face a great deal. Those who were told that some difference will always remain, shown the specific measurements involved, and given a realistic sense of the degree of correction achievable, tend to be pleased with smaller changes. A surgeon who gives a specific and qualified answer about how much correction they expect is a better sign than one who gives a confident one.
Surgeons look for these points at the consultation.
Facial asymmetry surgery suits adults with a visible difference between the two sides of the face that troubles them, whose facial growth is complete, whose asymmetry has been properly assessed with photographs and imaging, and who understand that the aim is to make the difference unremarkable rather than to produce a symmetrical face.
Reasons a good surgeon will ask you to wait or choose something else.
Facial asymmetry surgery is avoided where the asymmetry is progressive and has not been investigated, in untreated condylar hyperplasia or active growth, where a bite discrepancy requires orthodontic and jaw surgery first, in recent facial nerve palsy that may still recover, and in patients whose distress is disproportionate to a difference that others do not notice.
Ask your surgeon which technique they recommend for you and why.
A three-dimensional CT scan is used to design an implant that mirrors the fuller side onto the flatter one, then manufactured for that patient. The most precise option for skeletal asymmetry that does not involve the bite.
Bone is cut and moved to correct the asymmetry directly, for example rotating the chin segment back to the midline or repositioning the jaw. Used where the deviation is structural rather than a matter of missing volume.
The patient’s own fat is injected in fine layers to build up a flatter side where the difference is in soft tissue rather than bone, often over two or three sessions.
Botulinum toxin to balance an overactive muscle, or surgery to address facial nerve weakness, treats asymmetry that appears in movement rather than at rest.
Step by step, from arrival to discharge.
Standardised photographs from the front, both sides and below are taken before any facial asymmetry surgery, because they are the only reliable way to demonstrate what changed afterwards.
Clinical examination distinguishes bone from soft tissue and static from dynamic asymmetry, and a CT scan, sometimes with a bone scan, establishes whether growth is still active.
Where bone is involved, the deficiency is measured in three dimensions and the correction designed against it, either as a custom implant or as a planned bone movement.
General anaesthesia is used for bone work and implant placement; fat transfer alone may be done under sedation depending on the donor site.
Depending on the plan, a custom implant is placed and fixed to bone, a bone segment is cut and repositioned, or fat is injected in fine layers to build up the deficient side.
Wounds are closed with dissolving sutures, and a review is scheduled at 6 to 8 weeks when the sides can first be compared, with any second stage planned from 6 months.
Frequencies follow published guidance; your personal risk depends on your health and the surgeon.
The most important risk in facial asymmetry surgery is not surgical. It is operating on the wrong problem. Asymmetry has many causes, from a short jaw on one side present since birth, to condylar hyperplasia in which one jaw joint continues to grow, to old trauma, to facial nerve weakness that shows only in movement. Each needs a different treatment, and several need investigation before any operation is considered, because a progressive asymmetry corrected surgically will simply recur.
For that reason, any plan that begins with a procedure rather than with photographs, a clinical examination and usually a CT scan should be treated with caution. A second important risk is expectation. No face is symmetrical, including faces nobody regards as asymmetric, and a surgeon who promises symmetry is promising something that does not exist. The realistic and achievable aim is that the difference stops being the first thing you see.
Asymmetric by nature, which makes the early result misleading. Facial asymmetry surgery takes 6 to 8 weeks before the sides can be compared meaningfully.
Complete symmetry is not achievable and is not the goal. Some difference always remains, and a realistic plan says so before surgery rather than after.
Any procedure near the infraorbital or mental nerve causes temporary numbness of the cheek, lip or chin, usually recovering over 3 to 6 months.
Correcting asymmetry often requires more than one operation, particularly where fat transfer is used, and this should be planned and priced from the start rather than presented later as a complication.
Custom implants placed through the mouth carry the same infection risk as any facial implant, and an established infection usually means removal and replacement several months later.
Surgery along the jaw or in the midface can stretch branches of the facial nerve, causing temporary weakness of the lip or eyelid that usually recovers within 3 months.
Lasting numbness, or failure of a repositioned bone segment to heal. Uncommon after facial asymmetry surgery in experienced hands, and a reason to choose a craniofacial or maxillofacial unit.
Recovery from facial asymmetry surgery is emotionally harder than most facial surgery, because the first thing that happens is that the asymmetry gets worse. The operated side swells more, and for the first fortnight the face looks less balanced than it did beforehand. Patients who have not been warned about this find it distressing, and it is the single most useful thing to know in advance.
The timetable is also longer than for a straightforward cosmetic procedure. The sides do not become comparable until 6 to 8 weeks, transferred fat does not reach its final volume until 4 to 6 months, and where the plan involves a second stage, that is usually scheduled at 6 months or later. Judge nothing before then.
Days 1-3
The operated side swells more, which makes the face look worse than before surgery. This is expected. Soft diet, head elevated, cold compresses, and mouth rinses if the approach was intraoral.
Days 4-7
Swelling begins to fall and bruising turns. Wounds are checked before travel, which is normally cleared at around day 7 after bone work and day 5 after soft tissue procedures.
Weeks 2-4
Most visible swelling settles and desk work resumes. The face still feels tight and numb in places, and the corrected side remains fuller than it will finally be.
Weeks 6-8
Swelling is symmetrical enough that the two sides can be compared, and photographs taken now are worth keeping. Normal diet and exercise resume.
Months 6-12
Deep swelling resolves, transferred fat has settled to its permanent volume and sensation has returned. Any planned second stage is carried out from this point.
A good result from facial asymmetry surgery is a face that looks settled rather than corrected. Because the change is towards ordinariness rather than towards a new feature, people around the patient usually notice an improvement without identifying it, and often guess at weight loss or better sleep. Before and after photographs taken from identical angles are frequently the only way to show what actually changed.
Residual asymmetry always remains, and saying so is not a caveat but part of the result. The aim and the achievable outcome is that the difference stops being the first thing that is noticed, by the patient as much as by anyone else. Patients told this clearly beforehand are consistently more satisfied than those who were promised symmetry.
The result takes longer to appear than in most facial surgery. The two sides are not comparable until 6 to 8 weeks, transferred fat settles to its permanent volume at 4 to 6 months, and bone that has been repositioned is solid at 6 to 8 weeks but surrounded by resolving swelling for months. Facial asymmetry surgery should be judged between 6 and 12 months.
Where the correction addressed a stable cause, the result is durable. Custom implants and repositioned bone do not change. The caveat is asymmetry that was progressive and not fully investigated, which returns as the underlying process continues, which is exactly why the investigation comes first.
Facial asymmetry surgery is priced by the plan rather than by a procedure name, which makes headline figures particularly unreliable here. Fat transfer to one side is a short day-case operation; a custom implant designed from a CT scan adds a scan, a design process and a manufactured device; orthognathic surgery to correct a deviated jaw is major surgery with orthodontic treatment before and after.
The two costs most often left out of a first quotation are imaging and staging. CT planning and custom design are substantial items, and a second stage of fat transfer at 6 months is a normal part of many plans rather than a complication. Ask for both to be addressed in writing before you commit, because discovering them afterwards is how a reasonable price becomes an unreasonable one.
Where the asymmetry results from a congenital condition, trauma, cancer treatment or facial nerve palsy, treatment may be funded as reconstructive rather than cosmetic care in some health systems, usually through a referral pathway with documentation. It is worth investigating before assuming you must pay privately.
Why quotes for the same procedure differ, so you can compare packages fairly.
Options to weigh before deciding, surgical and non-surgical.
Balances mild soft tissue asymmetry for 12 to 18 months with no surgery, and previews a permanent correction before you commit to one.
Builds up a flatter side with your own tissue over one or more sessions, with no implant and nothing to become infected.
Balances an overactive muscle where the face is level at rest and pulls to one side in movement, and is reversible enough to serve as a test.
Where the jaws are mismatched and the bite is wrong, repositioning the jaws corrects the deviation at its source rather than disguising it.
Ask the same questions at every consultation so you can compare answers.
Some degree of facial asymmetry is universal: the two sides of every face differ in shape, size and position, and most people are unaware of it until they see a mirrored photograph of themselves. Asymmetry that is visible to others usually has a specific cause. Congenital conditions such as hemifacial microsomia produce an underdeveloped side present from birth. Condylar hyperplasia, in which one jaw joint keeps growing into adulthood, produces an asymmetry that increases over years. Old facial fractures, childhood torticollis, previous surgery and facial nerve weakness are all common causes.
This is why the assessment matters more than the surgery. An asymmetry that is still progressing must be investigated and stabilised before it is corrected, or the correction is undone by continued growth. A surgeon who orders imaging and, where relevant, a bone scan before proposing an operation is doing the important part of the job.
No, and no honest surgeon will promise it. Facial asymmetry surgery aims to reduce a difference to the point where it is no longer the first thing anyone notices, including you. Complete symmetry does not occur naturally and cannot be manufactured surgically, because bone, muscle, fat, skin and the facial nerve all differ between the sides and not all of them can be altered.
In practice, patients who are told this clearly before surgery are the ones who are satisfied afterwards. Those who were promised symmetry tend to be disappointed by results that objectively improved their face substantially.
Facial asymmetry surgery involving bone does need a CT scan, and it is a reasonable thing to insist on. A three-dimensional CT scan shows which side is deficient, by how much and in which plane, and allows a custom implant or a bone movement to be designed against measurements rather than against a visual impression. Judging a three-dimensional asymmetry by eye during surgery is unreliable, particularly once the tissue is swollen.
For asymmetry that is clearly confined to soft tissue, or that appears only during movement, photographs and clinical examination may be sufficient. A scan is not always necessary, but a plan that involves bone and does not involve imaging should prompt a second opinion.
Funding for facial asymmetry surgery depends entirely on the cause and on the country, and it is worth investigating before assuming either way. Asymmetry from a congenital craniofacial condition, from trauma, from cancer treatment or from facial nerve palsy is frequently treated as reconstructive and may be funded. Asymmetry that is within the normal range and treated for appearance alone is treated as cosmetic and is not.
Where funding exists it usually requires referral, documentation and sometimes a multidisciplinary assessment, and the pathway is different in every health system. Patients travelling abroad for surgery should be clear that they are almost always paying privately, and that follow-up at home for a privately treated complication may not be straightforward.
Facial asymmetry surgery is sometimes one operation and often not. Correcting a skeletal deficiency with a custom implant can be a single operation with a predictable result. Correcting an asymmetry that involves bone position, soft tissue volume and skin usually takes a staged plan: the structural work first, then refinement with fat transfer at 6 months or later, once the foundation has settled.
What matters is that staging is discussed and priced honestly at the outset. A second stage presented as part of the plan is reassuring; the same operation presented afterwards as an unexpected necessity is not.
Fillers do correct mild soft tissue asymmetry, and they are a sensible alternative to try before facial asymmetry surgery. Hyaluronic acid placed on the flatter side can balance the face for 12 to 18 months with no surgery and no recovery, and because it is reversible it is an excellent way to preview what a permanent correction would look like before committing to one.
Filler cannot correct asymmetry caused by bone position, and it cannot correct asymmetry that appears only in movement. Using increasing volumes of filler year after year to chase a structural problem is a common and expensive dead end, and the point at which a patient has been doing that for several years is usually the point at which surgery should have been discussed.
Only if it is meant to. Custom implants, fat transfer and soft tissue procedures sit outside the dental arches and do not change how the teeth meet. Osteotomies of the chin do not affect the bite either. Orthognathic surgery, which repositions the upper or lower jaw, deliberately changes the bite and requires orthodontic treatment before and after.
If your teeth do not meet correctly and your face is asymmetric, the two are almost certainly related, and an orthodontic and maxillofacial assessment should come before any cosmetic plan. Correcting the outside of a face whose jaws are mismatched addresses the appearance and leaves the function untouched.
Plan 7 days after facial asymmetry surgery involving bone or a custom implant, and 5 days after fat transfer or soft tissue procedures alone. The wait allows wounds to be checked and early bleeding or infection to be caught while you are still with the surgical team, which is the part that is genuinely difficult to manage remotely.
Take soft food and mouth rinse if the approach was intraoral, keep your head elevated during the flight, and expect the face to look temporarily more swollen and more asymmetric in the cabin.
An asymmetry that is worsening needs investigating before facial asymmetry surgery is considered. Asymmetry that has changed noticeably in adulthood is not normal variation, and the common causes include condylar hyperplasia, in which one jaw joint continues to grow, and less commonly a tumour or an inflammatory condition. Correcting a progressive asymmetry surgically without stopping the underlying process means it returns.
The usual investigations are a CT scan to map the skeleton and a bone scan to establish whether growth on one side is still active, sometimes repeated after an interval so the two can be compared. Any clinic willing to operate on an asymmetry that you report as worsening, without investigating why, is not treating you safely.
Usually they notice that something has improved without being able to say what. Because facial asymmetry surgery corrects a difference rather than changing a feature, the result reads as a face that looks more settled, and people commonly guess at weight loss, better sleep or a new haircut. Photographs taken from the front and from both sides before and after are often the only way to demonstrate what changed.
The exception is a large correction of a marked asymmetry, which is a visible change and is meant to be. Even then the change is towards an ordinary face rather than towards an obviously operated one.
Look for a craniofacial or maxillofacial background rather than a purely cosmetic one, because asymmetry correction draws on reconstructive techniques and frequently involves bone. Ask how many asymmetry cases they treat each year, whether they plan from CT imaging, and whether they work with a laboratory for custom implants.
Then ask two questions that reveal a great deal. Ask what they think is causing your asymmetry, and whether it needs investigating before treatment. And ask what degree of correction they expect to achieve, because a specific, qualified answer is a much better sign than a confident promise of symmetry.
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