Frozen Foreheads, Heavy Brows and Spock Arches: Why Wrinkle Injections Sometimes Look Wrong
Last updated: August 2026
Almost everyone who sits down in my consultation room in Hale to discuss anti-wrinkle injections arrives with the same worry, expressed in slightly different words.
"I don't want to look frozen."
"I don't want people to be able to tell."
"My friend had it done and her eyebrows went funny."
Those fears are not irrational. Everyone has seen a result that did not look right, and the ones that do look right are, by definition, the ones nobody notices. So the visible evidence available to any patient is heavily skewed toward what went wrong.
What is less well understood is why those results happen, and it is not the mysterious business it is often made out to be. The causes are technical, they are reasonably well described in the literature, and they are largely avoidable.
This article covers the five results patients notice most, what causes each one, what the trial data says about how often they actually occur, and what to ask before you let anyone near your face.
Key Takeaways
| Question | Short answer |
|---|---|
| How common are unwanted results? | Less common than social media suggests. In a real-world study of 4,000 patients, eyebrow droop occurred in 0.4% and eyelid droop in none |
| What causes them? | A meta-analysis of 9,669 patients found injection volume, both per site and in total, to be a significant factor in safety outcomes |
| Is it the product's fault? | No. The same product produces very different results in different hands |
| Can a poor result be fixed? | Often partially, and always eventually. Everything wears off |
| What separates a good result? | Anatomical assessment before the needle, appropriate dose, appropriate volume, and respecting known safety zones |
| What should a good result look like? | Softer lines with movement preserved. If anyone can tell, something has gone further than it should |
In This Article
- How common are unwanted results, really?
- The frozen forehead, and why it happens
- Heavy or drooping brows
- Asymmetry, and the difference between yours and theirs
- The Spock brow, or over-lifted arch
- When the lines are still there afterwards
- What the evidence says actually causes these outcomes
- What a good result should look like
- Can an unwanted result be corrected?
- How to choose someone to treat you
How Common Are Unwanted Results, Really?
Worth establishing before we go through the list, because the internet gives a badly distorted impression.
A meta-analysis of 32 randomised controlled trials covering 9,669 patients, published in Ophthalmic Plastic and Reconstructive Surgery, found that treatment-related adverse events were more common than with placebo, with a pooled risk ratio of 1.53. Eyelid and eyebrow malposition specifically had a risk ratio of 3.55.
So these things are real and they are more likely with treatment than without it, which should not surprise anyone. But real-world figures put the absolute risk in perspective. A 2025 study across six centres followed up 4,000 patients treated in the upper face:
| Outcome | Rate |
|---|---|
| Upper eyelid droop | Zero cases |
| Eyebrow droop | 0.4% |
| Mild bruising | 3.0% |
| Temporary headache | 1.8% |
| Dry eyes | 0.3% |
| All adverse events | 5.99% |
Two honest caveats. That study had no control group and no statistical analysis, so it is an observation rather than proof. And it reflects experienced practitioners in established clinics, which is not the whole market.
The useful conclusion is this: a bad outcome is uncommon, but it is not rare enough to ignore, and almost everything that determines which side of the line you land on happens before you leave the chair.
1. The Frozen Forehead
The most common concern by a wide margin, and the one people can describe most precisely even when they have not had treatment themselves.
A completely immobile forehead reads as artificial to anyone looking at it, and it often feels wrong to the person wearing it. Patients describe a sensation of heaviness, of the forehead being "stuck", or of having to work harder to make an expression.
| Why it happens | What should happen instead |
|---|---|
| Too much product across the forehead | Dose matched to the strength of that individual's muscle, which varies enormously |
| A standard dose applied regardless of the person | Assessment of how the face actually moves before deciding anything |
| Treating the forehead as a single flat sheet | Recognising that the frontalis muscle differs in shape, width and strength between people |
| Aiming to eliminate movement | Aiming to reduce excessive movement while preserving normal expression |
A forehead is supposed to move. It is how we signal surprise, interest, concern and warmth. The objective is softening the lines that movement creates, not removing the movement.
2. Heavy or Drooping Brows
This is the one that most often prompts someone to seek a second opinion, because it changes the whole eye area rather than just the forehead.
A heavy brow makes the eyes look smaller, more hooded and more tired, which is usually the precise opposite of what someone came in for. People describe feeling that their eyes have "closed down", or catching themselves in a mirror and looking cross.
The mechanism is mechanical and quite logical. The forehead muscle is the only muscle that lifts your brows. Several other muscles pull them down. If you substantially weaken the lifter without accounting for the depressors, the depressors win, and the brow sits lower than it did before.
This is more likely if:
- The forehead is treated too heavily, or too low, or too far toward the outer edge
- The muscles that pull the brow down are not addressed at all
- The person already has a low or heavy brow, which raises the stakes considerably
- Age-related brow descent is already present and has not been factored in
Correctly assessed, the same treatment can do the reverse: selectively relaxing the depressor muscles while treating the forehead conservatively can open the eye area and create a subtle lift. It is the same product and the same technique, applied with a different understanding of how those muscles interact.
3. Asymmetry
Here is something worth knowing before you look too hard in the mirror: nobody is symmetrical. Almost everyone has one brow that sits slightly higher, one side of the forehead that moves more, one eye that opens fractionally wider.
Most people have never noticed their own asymmetry until they start examining their face closely after treatment, at which point they attribute something lifelong to the injection.
That said, treatment can genuinely create or exaggerate asymmetry:
| What people notice | Why it can happen |
|---|---|
| One brow visibly higher than the other | Uneven dosing, or equal dosing applied to unequal muscles |
| One side of the forehead moving more | Placement not mirrored, or natural difference in muscle strength not accounted for |
| One side looking more "done" | Baseline asymmetry not assessed and documented before treatment |
The protection against this is unglamorous: look at the face properly first. Watch it at rest and in movement, note where it is already uneven, and adjust dose side to side accordingly rather than injecting a mirror image into a face that is not one.
4. The Spock Brow, or Over-Lifted Arch
Less discussed than the others and instantly recognisable once you know what you are looking at: an unnaturally peaked outer eyebrow, sometimes called a Spock or Mephisto brow.
It happens when the central forehead is treated while the outer portion is left with full strength. The untreated outer fibres keep lifting while the middle stays still, so the brow peaks sharply toward the tail instead of curving.
Causes:
- Injection points placed too centrally, leaving the outer forehead untouched
- Uneven distribution across the width of the muscle
- Failure to account for a forehead muscle that is wider than the injection pattern used
- Injecting a standard pattern rather than mapping where that person's muscle actually is
It is usually straightforward to soften with a small, well-placed adjustment, which is one of several reasons a review appointment at two weeks matters.
5. When the Lines Are Still There Afterwards
This one is not a technical error so much as a mismatch between what the treatment does and what the patient was expecting, and it is frequently nobody's fault except whoever failed to explain it.
Anti-wrinkle injections work on muscle. They do not work on skin.
Lines come in two broad types:
| Type | What it is | Does treatment help? |
|---|---|---|
| Dynamic lines | Only visible when you move. Caused by muscle contraction | Yes. This is what the treatment is for |
| Static lines | Visible at rest. Etched into the skin over years | Partially and gradually, by removing the folding that maintains them |
| Lines on thin, crepey or sun-damaged skin | A skin quality problem, not a muscle problem | Not really. This needs a different approach |
If the skin itself is thin, dehydrated or sun damaged, relaxing the muscle underneath will improve things only so far. This is why treating lines in isolation often disappoints, and why skin quality is worth addressing alongside, whether that is medical grade skincare, sun protection, or treatments aimed at the skin rather than the muscle.
Anyone who promises that a single injection appointment will remove a line that is visible when your face is completely still has either not looked carefully or is not telling you the truth.
What the Evidence Says Actually Causes These Outcomes
It is easy to assert that technique matters. It is more useful to point at the data.
The meta-analysis of 9,669 patients mentioned earlier did not stop at counting adverse events. It looked at what predicted them, and the authors identified a specific factor:
Individual injection volume and total injection volume were significant factors affecting safety outcomes.
— Gostimir M, Liou V, Yoon M. Ophthalmic Plast Reconstr Surg. 2023;39(1):13-25
That is worth translating, because it sounds technical and is not.
The product is supplied as a powder and reconstituted with saline before use. How much saline is used is a choice. The same number of units can be delivered in a small volume or a large one. A larger volume occupies more space in the tissue and spreads further from where it was placed, which is exactly how a nearby muscle you did not intend to treat ends up weakened.
So the finding is that a decision made at the point of mixing, before anyone picks up a needle, measurably affects whether you end up with a droopy brow. That is not a product characteristic. That is a practitioner decision.
The picture from the wider literature is consistent. A practical guide to avoiding upper face complications, published in Aesthetic Plastic Surgery, put it plainly:
"When the safety zones are respected, the chance of any of these complications is practically null."
— Borba A et al., Aesthetic Plast Surg. 2021
Safety zones are anatomically defined areas where injecting risks affecting structures you must not affect. They are known, they are published, and avoiding them requires knowing where they are in the face in front of you, which varies from person to person.
What that adds up to
| Factor | Decided by | Evidence that it matters |
|---|---|---|
| Dilution and injection volume | The practitioner, before treatment begins | Identified as a significant factor in a meta-analysis of 9,669 patients |
| Placement relative to safety zones | The practitioner, based on anatomy | Complications described as "practically null" when respected |
| Dose matched to the individual | The practitioner, after assessment | Consistently emphasised across the complications literature |
| Assessment of baseline asymmetry | The practitioner, before the needle | Standard practice in every published guide |
| Which product was used | Largely irrelevant to these outcomes | The same products produce good and poor results in different hands |
| What the patient did afterwards | Far less than any of the above | No trial evidence that aftercare behaviour affects these outcomes |
This is the part I would most like people to take away. When a result looks wrong, patients tend to blame the product, their own anatomy, or something they did afterwards. The evidence points overwhelmingly at decisions made before treatment started.
What a Good Result Should Look Like
A well-judged result is, almost by definition, invisible. Which creates an odd problem: you have seen thousands of them and never registered a single one.
What you should expect:
- You still look like yourself. Not a smoother, stranger version
- You still have expression. Reduced movement where it was excessive, not absent movement
- Your brows sit where they did, or very slightly better
- Nobody can identify what changed. They may say you look well or rested, or ask whether you have been away
- It feels like nothing. No heaviness, no tightness, no sense of a face you have to operate
The most reliable compliment after a good result is not "your forehead looks smooth". It is "you look well, have you been on holiday?"
Can an Unwanted Result Be Corrected?
Usually to some degree, and always eventually. This is genuinely the most reassuring fact in the whole field.
| Problem | What can be done | Timescale |
|---|---|---|
| Spock brow or over-lifted arch | A small, well-placed adjustment to the outer forehead often softens it | Days |
| Asymmetry from uneven treatment | Frequently adjustable with a small top-up on the under-treated side | Days |
| Heavy brow | Limited options. Sometimes helped by treating the depressor muscles, but largely a matter of waiting | Weeks to months |
| Frozen forehead | Nothing accelerates it. It wears off | Typically 3 to 4 months |
| Eyelid droop | Prescription eye drops can help in some cases. Otherwise it resolves with time | Weeks to a few months |
| Next time round | Reduce the dose, adjust the placement, change the volume | The most important correction of all |
Everything wears off. That is the fundamental safety net of this treatment and the reason it remains reasonable to try even if you are nervous. Nothing about it is permanent, including a result you dislike.
If you are unhappy with something, go back to whoever treated you first. A practitioner who wants to see you at two weeks, listens, and adjusts the plan for next time is doing the job properly. One who tells you it looks fine is not.
How to Choose Someone to Treat You
Given that almost everything depends on the person holding the needle, this is where your attention is best spent.
Questions worth asking
| Ask this | What a good answer sounds like |
|---|---|
| What are your qualifications, and are you on a professional register? | A named registration you can check yourself, such as the GMC, GDC or NMC |
| Who prescribes, and do they see me? | The prescriber assesses you in person. Remote prescribing for these treatments is not acceptable practice |
| What would you decline to do? | A specific, considered answer. "Nothing" is the wrong answer |
| What can this treatment not achieve for me? | Honest limitations, particularly about static lines and skin quality |
| How do you handle a result I am unhappy with? | A review appointment included as standard, and a clear process |
| What happens if something goes wrong out of hours? | A named contact and a plan. Not a social media inbox |
| Do you have insurance and complication management arrangements? | Yes, specifically, without hesitation |
Things that should give you pause
- Discounts, flash sales or loyalty schemes on a medical treatment. This is a prescription medicine, not a beauty product, and price promotions on it are not permitted advertising
- No consultation, or a consultation lasting two minutes. The assessment is the treatment
- Treatment on the day of first contact, with no reflection period
- A fixed price for a fixed number of areas, applied to every face regardless of what that face needs
- Pressure to treat more areas than you came in for
- Any suggestion that you can have as much as you like
- A prescriber you never meet
Why medical background matters here
Not as a claim that doctors are automatically better practitioners, which would be both unprovable and unfair to many excellent nurse and dentist injectors. The relevant point is narrower and more specific.
The complications discussed in this article are anatomical problems. Avoiding them requires a working knowledge of facial muscle anatomy, how those muscles interact, and where the structures you must not affect actually sit. Recognising and managing a complication when it occurs requires clinical training. And where a prescription medicine is involved, someone has to assess whether it is appropriate for you at all, given your health and your medication.
Those are the reasons to care about clinical background. Not the letters, the training behind them.
What I Can and Cannot Help With
| What this clinic does | What belongs with your GP or urgent care |
|---|---|
| Consultations for lines and wrinkles, and honest advice about what is achievable | Any difficulty breathing, swallowing or speaking after treatment. This is an emergency |
| Assessment of facial anatomy and how your face moves | Signs of a severe allergic reaction |
| Review appointments and adjustment of the plan | A diagnosable medical condition affecting your face or skin |
| Saying no when treatment is not the right answer | Anything that is not purely cosmetic |
Frequently Asked Questions
Will I look frozen?
Not if the dose is matched to your muscle and the aim is softening rather than elimination. A frozen look is the result of too much product, not of the treatment itself.
Why did my eyebrows drop after treatment?
The forehead muscle is the only one that lifts your brows. Weaken it too much without accounting for the muscles pulling down, and the brow sits lower. It is a mechanical consequence, not bad luck.
What is a Spock brow and can it be fixed?
An unnaturally peaked outer eyebrow, caused by treating the central forehead while leaving the outer part at full strength. It is usually straightforward to soften with a small, well-placed adjustment.
How common is a droopy eyelid?
Uncommon. A real-world study following up 4,000 patients treated in the upper face reported no cases at all, and eyebrow droop in 0.4%. It is a genuine risk rather than a likely one.
Is a bad result the product's fault?
Very rarely. The meta-analysis evidence points at injection volume and placement, both of which are practitioner decisions made before treatment begins.
Why are my lines still visible?
Because these injections work on muscle, not skin. Lines visible when your face is completely still are etched into the skin and need a different approach, usually one aimed at skin quality.
Can bad results be corrected?
Often partially, and always eventually, because everything wears off. Asymmetry and an over-lifted arch are frequently adjustable within days. A heavy brow mostly requires patience.
How long do I have to live with a result I do not like?
Typically three to four months for full wear-off, often less for the aspects that bother people most. That is the safety net of this treatment.
Should I go back to the person who treated me?
Yes, first. They know exactly what was placed and where, which matters a great deal if an adjustment is being considered. If they dismiss your concern, then seek another opinion.
Does a more expensive clinic mean a better result?
Not reliably. What correlates with a good result is assessment time, anatomical knowledge and willingness to do less. None of those is visible on a price list, which is why the questions above are worth asking.
Is it worth having a review appointment?
Yes, at around two weeks. It is the only way small adjustments get made while they still can be, and the only way next time gets better than this time.
Related Reading
- Anti-Wrinkle Injection Aftercare: Which Rules Are Real and Which Are Folklore
- Looking Refreshed, Not Frozen
- How to Choose an Aesthetic Clinic Safely
- Aesthetic Doctor or Aesthetic Practitioner: Why It Matters
- Why Some Aesthetic Treatments Look Unnatural
- Consultations for Lines and Wrinkles at Dr Caroline Warden Clinic
References
- Gostimir M, Liou V, Yoon MK. Safety of botulinum toxin A injections for facial rejuvenation: a meta-analysis of 9,669 patients. Ophthalmic Plast Reconstr Surg. 2023;39(1):13-25.
- Santorelli A, Salti G, Cavallini M, et al. Are post-care recommendations following upper-face botulinum toxin treatment scientifically necessary? A retrospective study based on 5000 patients. Toxins. 2025;17(8):372.
- Borba A, Matayoshi S, Rodrigues M. Avoiding complications on the upper face treatment with botulinum toxin: a practical guide. Aesthetic Plast Surg. 2021.
- Ramirez-Castaneda J, Jankovic J, Comella C, et al. Diffusion, spread, and migration of botulinum toxin. Mov Disord. 2013;28(13):1775-1783.
About the Author
Dr Caroline Warden is a practising NHS GP and aesthetic doctor with nearly twenty years of clinical experience, an independent prescriber, and holder of a Level 7 postgraduate diploma in cosmetic injectables. She is Medical Director and sole practitioner at Dr Caroline Warden Skin & Aesthetic Clinic, 2 Crown Passages, Hale, Altrincham, a family-run clinic she runs with her sister Louise, seeing patients from Hale, Hale Barns, Bowdon, Altrincham, Timperley, Sale, Alderley Edge, Wilmslow, Knutsford and across Cheshire and South Manchester. You will only ever see and be treated by Dr Caroline Warden. GMC number 6157708.
