Botulinum toxin and nasal alae: the nasalis muscle and function
- Muscle
- Highlighted area
Quick facts
- Topic
- Toxin in the nasal alae and the nasalis muscle
- Structures
- Alar part of the nasalis, nostril dilator and neighbors
- Attention
- Breathing function and upper lip symmetry
- Main safeguard
- Assess breathing and nasal obstruction before any decision
The nose looks like a motionless structure, but the alae move: they dilate on forced inspiration, widen when the patient smiles or talks, and can "flutter" in some people with marked muscle activation. When the patient's complaint is this movement, and not the fixed shape of the nose, the question about botulinum toxin comes up. The answer calls for knowledge of anatomy, an assessment of breathing and caution with function.
This page gathers, at a review level, what is known about the nasalis muscle, what the toxin can and cannot do in this area and the main risks. There is no dose, point or technique. Management is the decision of the qualified professional, according to the product label and the rules of their professional council.
Functional anatomy of the nasal ala
The nasal ala is made of alar cartilage and fibrofatty tissue, covered by skin and moved by small muscles. The main ones involved:
| Structure | Role | Why it matters |
|---|---|---|
| Nasalis muscle, alar part | Dilates the nostrils, especially in forced breathing | Target of the dynamic approach to the ala |
| Nasalis muscle, transverse part | Compresses the nostril and acts on the dorsal region | Nasal lines ("bunny lines") |
| Depressor septi nasi | Pulls the tip and septum down | Drooping tip when smiling |
| Levator labii superioris alaeque nasi | Lifts the upper lip and the ala | A neighbor that influences the fold and the smile |
| Orbicularis oris | Sphincter of the mouth | Balance of the upper lip |
The alare also has a structural component: width, skin thickness and cartilage. This explains why not every complaint of a "wide ala" is muscular.
When does the conversation make sense?
A dynamic approach to the nasal ala tends to be considered when:
- Nostril flaring is evident in expressions, such as smiling, talking or straining.
- The asymmetry is accentuated by contraction and absent at rest.
- The patient is aware of the movement and bothered by it in photos and videos.
- There is no complaint of nasal obstruction or relevant functional change.
When the complaint is structural (a wide ala at rest, a bulbous tip, a broad nasal base), the toxin has little to offer. These situations call for assessment of nonsurgical rhinoplasty, surgery or other strategies, discussed by those who work in the field. See also nasal anatomy for injectables.
How to separate dynamic from structural
- Observe the nose at rest, from the front, the side and below.
- Ask for a smile, speech, a deep breath and varied expressions.
- Compare width and symmetry at rest and in movement.
- Palpate and assess skin thickness and the consistency of the ala.
- Record short photos and videos in each situation.
This sequence reveals whether the complaint is about movement or shape, and avoids promising from the toxin what it does not deliver.
What the toxin can and cannot do
Botulinum toxin reduces the contraction of the muscle it acts on. In the nasal alae, this can lessen the flaring that happens in expression. The effect is temporary and limited to movement.
| It can, in some cases | It does not |
|---|---|
| Lessen dynamic nostril flaring | Narrow the bony or cartilaginous base of the nose |
| Soften visible movement of the ala | Change the tip shape structurally |
| Reduce asymmetry caused by contraction | Correct a deviated septum or obstruction |
| Complement a broader strategy | Replace a rhinoplasty |
For those seeking other approaches to the nose, nonsurgical rhinoplasty and hyaluronic acid on the nasal dorsum are separate topics, with their own vascular risks. The nose is considered a high vascular risk area, described in vascular danger zones of the face and nasal vascular occlusion.
Risks and unwanted effects
In a small and functional area, the risks should be explicit:
- Change in nasal breathing: a feeling of a "heavy" nostril or less air coming in, especially with effort.
- Asymmetry of the nose or upper lip: spread to neighboring muscles can change the smile.
- Changes in expression: a less expressive smile, loss of naturalness.
- Toxin spread: see toxin spread, with the possibility of an effect on adjacent structures.
- Bruising and local pain, as with any injectable.
- Insufficient result, when the complaint was structural.
It is worth remembering that injecting into vascularized areas of the nose requires anatomical knowledge. For a general overview of toxin complications, see complications with botulinum toxin and stiff smile after toxin.
How to assess breathing function at the consultation
A specialized exam is not needed for screening, but some questions and observations help:
- Do they breathe well through both nostrils? Does one often get blocked?
- Do they use a decongestant, have allergic rhinitis or recurrent sinusitis?
- Do they exercise intensely, and feel the nose close up with effort?
- Have they had nasal surgery? Do they have a diagnosed deviated septum?
- Do they snore, have apnea or sleep with the mouth open?
On observation, notice whether the patient mouth-breathes at rest and whether the alae collapse on a deep breath. If there are signs of obstruction, referral for an otolaryngology evaluation before proceeding is a prudent course, as in referring patients in HOF.
How to explain it to the patient
Documentation and consent
The informed consent should mention the possibility of mild functional change, asymmetry and spread, in addition to the general risks of the toxin. Photos and a short video at rest, smiling and on deep inspiration document the starting point. The items of a consent form are in informed consent by procedure, and the logic of recording is in standardized clinical photography.
Timeline
What Harmy does and does not show in the nose
Harmy has no marking point for the nose, and does not simulate toxin in the nasal alae. The app's nine areas are Glabella, Temple, Tear trough, Cheekbone, Nasolabial fold, Mouth corner, Lips, Chin and Jawline. For the conversation about the nasal ala, the app is not the tool.
Quick review
The nasal ala is an area where aesthetics and function meet. Those who assess carefully, separate the dynamic from the structural and respect the patient's breathing are more likely to offer a useful approach, or to recognize that the answer lies elsewhere.
Frequently asked questions
Can botulinum toxin make the nasal alae smaller?
In some patients, reducing contraction of the nasalis muscle can lessen dynamic nostril flaring, for example when smiling or talking. It does not change the cartilage structure or the underlying shape of the nose.
Does toxin in the nasal alae interfere with breathing?
In theory it can, because the muscle takes part in dilating the nostrils, mainly in forced breathing. That is why assessing any prior nasal obstruction, and caution, are important.
Who benefits from a dynamic approach to the nose?
Generally, the patient whose complaint is flaring or movement of the nostrils during expression, not the fixed shape of the ala. The indication is individual.
Does the toxin change the shape of the nose permanently?
No. The effect is temporary and limited to muscle contraction. Structural changes require other approaches, such as nonsurgical rhinoplasty or surgical procedures.
Harmy images are illustrative simulations generated by AI from the patient's photo to support the conversation between practitioner and patient. They are not a promise of results. Indication, technique, product and volume are solely the decision of the licensed practitioner. This content is for information only and does not replace a clinical assessment.