You're looking in the mirror after laughing, squinting, or scrunching your nose, and you notice two diagonal creases spreading across the upper sides of your nose. They may disappear when your face relaxes, or they may linger long enough to make you wonder whether you're developing a new type of wrinkle. These are commonly called bunny lines on the face, and understanding their anatomy is the first step toward treating them without over-relaxing the surrounding expressions.
Table of Contents
- What Bunny Lines Actually Look Like
- The Anatomy Behind Bunny Lines
- Why Bunny Lines Form and What Makes Them Worse
- Botox vs Dysport for Bunny Lines
- How Injectors Place Botox for Bunny Lines
- Treating Bunny Lines as Part of a Full Face Plan
- Results Timeline and Aftercare for Bunny Line Treatment
- Candidacy and Booking a Bunny Line Consultation in Bel Air
What Bunny Lines Actually Look Like
Scrunch your nose gently in the mirror. You may see two or three diagonal lines fan outward from the bridge of your nose across the upper sidewalls. They usually appear during expressions such as laughing, squinting, sniffing, or talking with an animated nose movement.
In plain language, bunny lines are dynamic nasal wrinkles. They form when nearby facial-expression muscles contract and pull the skin around the nasal bridge and upper sidewalls. The lines aren't the same as forehead creases, which usually run horizontally across the forehead, or crow's feet, which radiate from the outer corners of the eyes.
How to identify them
Look for these practical clues:
- Location: The creases sit on either side of the nasal bridge, rather than between the eyebrows or beside the outer eyes.
- Direction: They commonly angle diagonally across the upper nose.
- Movement: They become clearer when you scrunch, smile, laugh, or squint.
- Resting appearance: With repeated movement and reduced skin elasticity, they can remain visible even when your face is relaxed.
A 2026 anatomical review describes this region as a non-muscular interval called the “bunny triangle,” located between the medial canthus, the inner corner of the eye, and the nasal dorsum, or bridge of the nose (anatomical review of bunny lines). That description matters because bunny lines aren't produced by one isolated “bunny line muscle.” They're a visible pattern created by nearby structures working together.
The name can sound playful, but the concern is common in aesthetic consultations. Some people notice the lines only during expressions. Others become aware of them after nearby upper-face treatment changes which movements remain most visible.
The Anatomy Behind Bunny Lines
A crease on the side of the nose can come from several muscles acting together. The nose is a small convergence zone, so the visible fold does not identify one isolated muscle or one universal injection point. Its direction and depth reflect how nearby muscles pull the skin during expression.
The levator labii superioris alaeque nasi lifts the upper lip and nasal ala, or nostril wing. Its upper fibers can contribute to the diagonal movement along the nasal sidewall. The transverse nasalis spans the bridge of the nose and helps create movement across the nasal dorsum. Near the inner eye, the medial fibers of the orbicularis oculi influence the edge of the area and may contribute to the pattern seen during squinting or smiling.
How the muscles guide treatment
As described in the previous section, the bunny triangle identifies the small interval where this movement becomes visible. It describes a region, not a muscle that can be treated alone.
That distinction changes how an injector assesses the face. The strongest crease may sit beside the muscle creating much of the movement. Treating only the line can therefore miss the active pull. Placing toxin too close to the inner eye can also influence nearby periorbital movement, so location and dose require careful anatomical judgment.
A full upper-face assessment helps connect the nasal movement with the glabella, forehead, and eye area. The nasal sidewall may be the most noticeable part of a broader expression pattern, particularly after another upper-face zone has been treated. Planning should follow the muscles producing the movement, rather than a memorized point or the deepest line visible at rest.
Two people can show similar bunny lines and still need different injection locations. One may rely more on the nasalis, while another shows greater involvement from the muscles near the inner eye or upper lip. The goal is to soften the unwanted contraction while preserving natural expression.
Why Bunny Lines Form and What Makes Them Worse
Bunny lines usually begin as expression-related folds. Each time the nasal sidewall contracts, the skin bends along a familiar path. Over time, repeated folding can make the crease more noticeable and less dependent on an active expression.
Common triggers include:
- Sniffing: The nose naturally moves during repeated sniffing.
- Squinting: Inner eye and nasal muscles may contract together.
- Laughing: Animated smiles can pull several upper-face zones at once.
- Talking: Some people scrunch their nose during emphasis or concentration.
- Adjusting glasses: Repeated pressure or facial movement around the bridge can draw attention to the area.
Dynamic movement isn't the only factor. UV exposure, smoking, dehydration, and natural collagen loss can reduce the skin's ability to rebound after folding. As elasticity changes, a line that once appeared only during a strong scrunch may remain visible when the face is still.
Why they may appear after other treatment
Patients sometimes notice bunny lines after treating the glabella or crow's feet. That doesn't necessarily mean the earlier treatment created a new wrinkle. When one expression zone relaxes, the face may reveal a different movement pattern during smiling, squinting, or laughing. The nasal sidewall can become the more visible convergence zone.
Historical clinical data support the idea that nasal wrinkles often coexist with other upper-face creasing. In an early series involving 250 patients treated between 1997 and 2004, 40% had satisfactory treatment after initial bilateral 3-unit injections, while 60% still had nasal rhytids after nasalis treatment; 30% had persistent wrinkles at the nasal root, and another 30% had wrinkles at both the nasal root and between the eyes (early clinical series on nasal wrinkles). These findings reinforce an important point, bunny lines often belong to a larger pattern rather than appearing alone.
Botox vs Dysport for Bunny Lines
Both Botox and Dysport are botulinum toxin products used to reduce targeted muscle activity. For bunny lines, the treatment area is small, so precision matters more than using a large amount.
Botox contains onabotulinumtoxinA, while Dysport contains abobotulinumtoxinA. Their units aren't interchangeable. Published technique guidance for this region describes approximately 2 units of onabotulinumtoxinA per side in one consensus approach, while other technique papers describe 3 to 5 units for a lateral nasal sidewall depending on anatomy and severity (nasal injection technique guidance).
| Attribute | Botox, onabotulinumtoxinA | Dysport, abobotulinumtoxinA |
|---|---|---|
| Unit system | Uses Botox-specific units | Uses Dysport-specific units |
| Typical approach | Small, highly localized dosing | Small, carefully controlled dosing |
| Spread considerations | More localized feel may suit precise first treatment | Slightly broader spread may suit selected nasal patterns |
| Main safety concern | Avoid placing toxin too close to the inner eye | Wider diffusion requires careful medial orbicularis oculi protection |
| Patient fit | First-time patients seeking a tightly controlled plan | Patients familiar with Dysport and its movement pattern |
Dysport may spread slightly wider, which can be useful when the nasal sidewall movement extends beyond one narrow point. It also demands careful placement near the medial orbicularis oculi, because excessive weakening in that area can make the under-eye look more prominent or alter the natural elevation pattern during smiling.
A practical framework is simple. A first-time patient may prefer the predictability of a tightly localized Botox plan, while someone who already knows how Dysport feels may choose to maintain that familiar product. The decision should follow the person's anatomy, expression pattern, prior response, and injector's assessment. ProMD Health Bel Air discusses how aesthetic planning can extend beyond a single product in its guide to the future of aesthetic treatments.
How Injectors Place Botox for Bunny Lines
A careful bunny-line injection begins with movement, not a syringe. The injector may ask you to sniff, squint, laugh, or scrunch your nose so the diagonal crease and the direction of muscle pull become visible.
The landmark-based plan
The clinician typically reviews three landmarks:
- The bony bridge: This provides a central reference for the nasal dorsum.
- The nasal ala: The outer edge of the nostril helps establish the sidewall's position.
- The active crease: A deliberate scrunch shows where the skin folds and which fibers are contributing.
A 2022 anatomical guideline recommends 2 units on each side, placed where a horizontal line through the rhinion, the nasal root region, meets a vertical line through the medial canthus. The guideline places the toxin in the upper part of the levator labii superioris alaeque nasi region on each side (2022 anatomical guideline for bunny-line injections).
Why placement is conservative
The injector uses a small needle and a superficial intramuscular approach. The angle may be perpendicular or slightly oblique, depending on the anatomy and the selected point. Most patients feel a brief sting and may develop a small temporary wheal or pinpoint area of redness.
No cannula or deep placement is generally needed for this small muscular target. The clinician's safety checks focus on keeping the injection close to the nose and away from the medial orbicularis oculi. Moving too far laterally can weaken this inner-eye muscle and may contribute to an undesirable eye-bag appearance or a change in smiling mechanics (precision dosing and medial orbicularis oculi considerations).
The objective isn't to eliminate every movement. It's to soften the pull while preserving a natural nose and smile. ProMD Health Bel Air provides additional patient education about targeted Botox planning in its guide to Botox for marionette lines.
Treating Bunny Lines as Part of a Full Face Plan
Bunny lines make more sense when evaluated alongside the glabella, forehead, and crow's feet. These areas share expression patterns, and treating one zone can change which movement stands out in another.
A clinician may first assess whether the nasal lines are mild and visible only during an expression, or whether they remain etched at rest. If the glabella and crow's feet are also active, treating the full upper-face pattern may create better balance than adding toxin to the nose alone.
A full-face study involving 189 patients found that bunny lines were injected in 71.8% of cases, demonstrating that this concern commonly appears within upper-face treatment rather than as an isolated request (full-face treatment study).
| Combination | Approximate share of bunny-line patients | Clinical rationale |
|---|---|---|
| Bunny lines with broader upper-face treatment | 71.8% | Coordinates nasal movement with nearby expression zones |
| Bunny lines treated as an isolated area | Remaining cases | May suit patients whose concern is limited to nasal movement |
When toxin isn't the whole answer
Botulinum toxin works best when movement drives the crease. If a deep line remains visible at rest after muscle activity has settled, a clinician may discuss whether a structural approach is appropriate. Hyaluronic acid filler along a dorsal crease is sometimes considered, but the nose is a highly sensitive anatomical region and requires careful professional assessment.
Residual texture may also lead to discussion of microneedling or laser treatments. These options address skin quality rather than replacing the muscle-relaxing role of toxin. For broader background on why facial creases develop, patients may find this explanation of the causes of lines on face useful, particularly when distinguishing expression-related lines from changes in skin texture and support.
Results Timeline and Aftercare for Bunny Line Treatment
Most patients want to know two things, when will the lines soften, and what should they avoid afterward? The answer is gradual rather than immediate. Botulinum toxin changes muscle activity over several days, so the first mirror check won't show the final result.
The first day
For the first 24 hours, protect the injection area from unnecessary pressure and friction:
- Leave the nose alone: Don't rub, massage, or press on the treated points.
- Avoid face-down positioning: Sleep and rest without prolonged pressure on the bridge.
- Skip heavy workouts: Follow the clinic's activity guidance after treatment.
- Reduce external pressure: Avoid hats or sunglasses that press firmly across the bridge.
Mild pinpoint redness, a small bump at an injection site, or a faint headache can occur after treatment. These effects are usually temporary, but your clinic should provide individualized instructions based on your health history and treatment plan.
What changes over the next weeks
Light softening may become noticeable around day 3, especially when you deliberately scrunch your nose. The effect continues developing, and the two-week point is the appropriate time for a full assessment and any discussion of a retouch.
Most patients think in terms of a three-to-four-month maintenance window, after which movement gradually returns (nasal toxin dosing guidance). Individual duration varies with muscle strength, dose, metabolism, and treatment history.
Call the clinic promptly if you develop symptoms that feel severe, progressive, or different from the expected local reaction. Seek urgent medical attention for serious breathing, swallowing, vision, or widespread weakness symptoms. Those reactions are uncommon, but they shouldn't be ignored.
Candidacy and Booking a Bunny Line Consultation in Bel Air
A suitable candidate is an adult bothered by diagonal nasal creases that appear during expression, remain visible at rest, or both. The best results come from realistic expectations. Toxin can soften muscle-driven lines, but it won't guarantee a completely motionless nose or erase every etched crease.
A clinician may postpone treatment if you have an active infection at the injection site. You should also discuss pregnancy, neuromuscular disease, allergies, medications, previous reactions, and any earlier toxin or filler treatment before moving forward.
Preparing for the appointment
Bring practical information that helps the injector assess your full expression pattern:
- Medication list: Include prescriptions, supplements, and over-the-counter products.
- Prior treatment records: Note previous Botox or Dysport products, locations, and reactions.
- Expression photographs: Photos showing the scrunch, smile, or squint that bothers you can be useful.
- Specific goals: Explain whether you want movement softened, resting lines reduced, or better balance after other upper-face treatment.
During the consultation, the injector will distinguish dynamic lines from etched lines, observe your nasal and upper-face movement, and consider whether bunny lines should be treated alone or as part of a broader Botox or Dysport plan. Many new patients don't start with this area as their first neurotoxin request. They often mention it later, after noticing how facial balance changes when other expression zones are relaxed.
For local patient education, you can review ProMD Health Bel Air's information about Botox in Bel Air, Maryland before scheduling. A consultation gives you the opportunity to ask about product choice, placement, expected movement, and whether your lines need toxin, skin-focused care, or a different approach.
ProMD Health Bel Air offers Botox and Dysport consultations for expression lines, including bunny lines, with treatment planned around your individual facial movement. Visit ProMD Health Bel Air to request a consultation in Bel Air and discuss a precise, natural-looking plan for your nose and upper face.
