A small bruise or tenderness at the injection site, uneven eyebrows, or an eyelid that starts to droop a few days later are all different possible consequences of botulinum toxin treatment. In the first case, it is a normal tissue response to an injection. In the other two, it may be an unwanted change in muscle function that should be assessed with a doctor. The most typical unwanted effects are related to excessive weakening of the target muscle or an effect on a neighboring one. This can change the position of the eyebrows or eyelids, facial symmetry, the smile, or the function of the muscles around the eyes.
We have explained in detail how botulinum toxin works, which wrinkles it can correct, and where the method’s possibilities end in a separate article.
What is normal after Botox, and what needs attention
A skin puncture itself can cause mild soreness, redness, swelling, or bruising. These local reactions are known with botulinum toxin injections and usually gradually subside. Another group of changes is related to the action of the drug itself. Botulinum toxin weakens the function of the selected muscle — this is exactly what the effect of the procedure is based on. A problem arises if the weakening is stronger than necessary, changes the usual balance between muscles, or affects a neighboring structure.
| What appeared after the procedure | What it may mean | What to do |
|---|---|---|
| A small bruise, redness, or tenderness near the injection point | Tissue reaction to the injection | Observe: the symptoms should gradually subside |
| Headache | A known side effect | If the pain is severe, unusual, or prolonged, contact your doctor |
| One eyebrow temporarily moves more actively or has become higher than the other in the first few days | The effect is still developing, or the muscles are responding at different speeds | Wait until the full effect has developed; if the asymmetry persists, discuss it with your doctor |
| The eyebrows have dropped, and the gaze looks “heavier” | Possible excessive weakening of the forehead muscle | Contact the doctor who performed the procedure |
| The edge of the upper eyelid has drooped | Possible upper eyelid ptosis | See a doctor |
| Dry or irritated eyes, light sensitivity | Possible disruption of normal muscle function around the eye | If the symptoms persist, see a doctor |
| Double vision or a noticeable change in vision | Unwanted ophthalmic effect | Do not delay medical assessment |
| Problems with speech, swallowing, or breathing; pronounced generalized muscle weakness | Possible clinically significant systemic effect | Urgent medical care is needed |
In the first few days after the procedure, uneven facial movement does not necessarily mean the correction has failed. The effect of botulinum toxin develops gradually, and different muscles — or even separate areas of the same muscle — may not respond at exactly the same time. As a result, one eyebrow may temporarily move more actively, one side of the forehead may smooth out faster, and a slight asymmetry may decrease as the full effect develops. It is best to make a final assessment of facial balance once the effect of the drug has stabilized. If asymmetry persists after that, it is then assessed as a possible unwanted result, and the doctor will decide whether correction is needed.
The frequency of specific reactions depends on the product, treatment area, dose, and injection protocol. For example, in clinical studies of BOTOX Cosmetic, upper eyelid ptosis after glabellar correction was reported in about 3% of participants. When the forehead and glabella were treated at the same time, headache was reported in 9%, eyelid ptosis in 2%, and brow ptosis in 2%. After correction of “crow’s feet,” eyelid swelling was reported in about 1% of cases. These figures apply to onabotulinumtoxinA in specific study protocols: units of different botulinum toxin products are not interchangeable.
Eyelid ptosis, “heavy brows,” and asymmetry — what is the difference?
After botulinum toxin treatment, patients often describe any change around the eyes as a “drooping eyelid.” In reality, these may be different situations.
Brow ptosis is drooping of the eyebrow itself. The forehead muscle lifts the eyebrows, and in some people it constantly helps keep them in their usual position. If it is weakened too much or the balance between muscles changes, the eyebrow may shift lower. The tissues above the upper eyelid then also look heavier, although the edge of the eyelid itself remains in place.
Upper eyelid ptosis looks different: it is the eyelid margin itself that droops. After injections in the upper third of the face, this can happen if the action of botulinum toxin spreads to the muscle that lifts the upper eyelid. Ptosis is often noticeable on only one side and may not appear immediately after the procedure, but several days later, as the effect of the drug increases.
Therefore, if the “eyelid has drooped” after Botox, the first step is to determine whether the position of the eyelid itself or the eyebrow has changed. These situations can look similar from the outside, but they are corrected in different ways.
Asymmetry after Botox can appear as different eyebrow heights, uneven forehead mobility, or stronger muscle contraction on one side. Sometimes the outer part of the eyebrow rises unnaturally high — this effect is known as the Mephisto sign or Spock brow.
The face is rarely perfectly symmetrical before the procedure. An initial difference in eyebrow position, muscle strength, or facial expression may become more noticeable after botulinum toxin treatment. In other cases, a new asymmetry is indeed related to a different degree of effect on the right and left sides. This is why, before injections, the doctor assesses the face not only at rest but also during active facial movement.
Unwanted changes can occur in other areas as well. Excessive weakening of the muscles around the mouth can change the smile or lip function, and after injections into the masseter muscles, chewing strength may sometimes temporarily decrease. When treating the neck area, injection precision is especially important because nearby muscles are involved in swallowing.
Can a bad Botox result be corrected?
Botulinum toxin does not have an equivalent of hyaluronidase, which can quickly dissolve a hyaluronic acid-based filler. Once botulinum toxin has taken effect, it is not possible to instantly return the muscle to its initial activity. Its function recovers gradually. However, some unwanted aesthetic results can be corrected.
In cases of mild asymmetry, the doctor can sometimes balance muscle activity with an additional local injection. But it is too early to assess the result in the first few days: the effect of the product develops gradually. We have explained separately when Botox starts working, when the result is assessed, and how long it usually lasts.
In true upper eyelid ptosis, the doctor may prescribe eye drops that temporarily help lift the eyelid slightly. Apraclonidine or oxymetazoline may be used for this purpose. This treatment does not reverse the action of botulinum toxin, but it can reduce the severity of ptosis during the recovery period. In cases of brow drooping, this approach does not eliminate the cause of the problem, because it is related to the balance of the muscles that determine eyebrow position.
There is no reliable way to speed up the wearing-off of botulinum toxin with massage, sauna, warming, or at-home device-based procedures. The usual approach includes observation, symptomatic treatment, and, if necessary, targeted medical correction.
When urgent care is needed after Botox
An asymmetric eyebrow or an overly immobile forehead may require correction, but they are usually not emergencies. Symptoms that go beyond a local effect are a different matter.
The prescribing information for botulinum toxin products warns about the possibility of the toxin’s effect spreading beyond the injection area. Possible symptoms include pronounced generalized muscle weakness, double vision, and problems with speech, swallowing, or breathing. They may appear hours or even weeks after the injection. If there are problems with swallowing, speech, or breathing, immediate medical attention is needed.
For approved cosmetic doses of BOTOX Cosmetic, serious consequences of distant spread of effect are not a typical scenario. However, it is important not to ignore symptoms that could point to it.
Urgent care is also required for an acute hypersensitivity reaction with increasing swelling of the face, lips, or tongue, shortness of breath, or other signs of anaphylaxis.
After injections near the eyes, it is important to pay attention to persistent dryness, light sensitivity, and visual disturbances. Botulinum toxin in this area can affect blinking and protection of the ocular surface; if the symptoms do not go away, an ophthalmologist’s examination may be needed.
In most cases, unwanted effects of aesthetic botulinum toxin treatment remain local and gradually subside as the drug’s action wears off. If the position of the eyebrows or eyelids, the smile, or muscle function has changed after the procedure, the most useful first step is to identify the cause together with a doctor. This will determine whether observation is enough or whether the result can be corrected.
Sources
- BOTOX Cosmetic (onabotulinumtoxinA). Full Prescribing Information. AbbVie. Revised October 2024.
- Borba A, Matayoshi S, Rodrigues M. Avoiding Complications on the Upper Face Treatment With Botulinum Toxin: A Practical Guide. Aesthetic Plastic Surgery. 2022;46(1):385-394.
- Nestor MS, Han H, Gade A, et al. Botulinum toxin-induced blepharoptosis: Anatomy, etiology, prevention, and therapeutic options. Journal of Cosmetic Dermatology. 2021.
- Bernardini FP, Skippen B, Croasdell B, et al. Management of Severe Botulinum-Induced Eyelid Ptosis With Pretarsal Botulinum Toxin and Oxymetazoline Hydrochloride 0.1%. Aesthetic Surgery Journal. 2023;43(9):955-961.