Bunny lines are the fine diagonal wrinkles that appear on the sides of the nose when you smile, squint, or scrunch your nose. They are common, often appear earlier than people expect, and can gradually deepen from expression-only lines into permanent creases. Understanding what drives them — and what can realistically slow or reduce them — helps you make informed decisions about both daily skincare and professional treatment.
Key Takeaways
- Bunny lines are caused primarily by repeated contraction of the nasalis muscle and are made worse by collagen loss, sun exposure, and certain injection patterns.
- Dynamic bunny lines appear only during expression; static bunny lines are visible at rest and indicate deeper structural change requiring more than topical care.
- Daily broad-spectrum SPF, retinoids, and hydrating ingredients form the foundation of at-home prevention.
- Botulinum toxin (neuromodulator) treatment can relax the nasalis muscle and is the most established professional option; results typically last three to six months.
- Bunny lines can also develop as a side effect of Botox treatment elsewhere on the face — choosing an experienced injector reduces this risk.
What Are Bunny Lines?
Bunny lines are fine to moderate wrinkles that run diagonally or obliquely across the sides of the nose, roughly from the nasal bridge downward toward the cheeks. They are named for their resemblance to the way a rabbit wrinkles its nose. The lines become most visible during facial expressions such as laughing, smiling, squinting, or deliberate nose scrunching, though with time they can remain visible even at rest.
These wrinkles are sometimes called nasal wrinkles or nose wrinkles, and they are distinct from the vertical frown lines between the brows (glabellar lines) or the horizontal lines across the forehead. Bunny lines sit in a specific anatomical zone where several muscles converge, which is why they respond differently to treatment than wrinkles in other areas.
The Anatomy Behind Bunny Lines
The primary driver of bunny lines is the nasalis muscle, specifically its transverse portion, which runs across the bridge and sides of the nose. When the nasalis contracts — during any expression that involves the nose — it compresses the overlying skin and creates the characteristic diagonal fold. Over time, with thousands of repetitions daily, this fold becomes etched into the skin.
Several neighbouring muscles contribute to the same movement. The levator labii superioris alaeque nasi (sometimes called the LLSAN or informally the "Elvis muscle") lifts the upper lip and flares the nostril. The medial fibres of the orbicularis oculi, which encircle the eye, and the procerus muscle at the top of the nose also pull on the same region during squinting and frowning. This convergent traction from multiple muscles means the skin in this area is under repeated stress from several directions simultaneously.
Anatomists sometimes refer to a "bunny triangle" — a non-muscular interval on the nasal sidewall where the skin has relatively little underlying support. Because muscle fibres do not directly underlie this zone, the skin here is particularly susceptible to folding under traction from surrounding muscles, which is why the wrinkle tends to appear in a consistent location across different people.
Why Do Bunny Lines Form? Key Causes
Several factors determine how early bunny lines appear and how quickly they deepen. Most people experience a combination of these rather than a single cause.
Repetitive Facial Expressions
Repetitive facial expressions are the most direct cause. Every time you smile, laugh, squint in bright light, or scrunch your nose, the nasalis and surrounding muscles contract and fold the overlying skin. In younger skin with good elasticity, the skin springs back fully after each expression. As elasticity declines, the fold begins to leave a trace even after the expression has passed.
Collagen and Elastin Loss with Age
Collagen and elastin are the structural proteins that keep skin firm and resilient. Collagen production slows progressively from the mid-twenties onward, and elastin fibres become less effective at returning skin to its resting position after movement. As this structural support diminishes, the repeated folding caused by muscle contraction creates increasingly permanent creases. This is the mechanism by which dynamic wrinkles — those visible only during expression — gradually become static wrinkles that are present at rest.
Sun Exposure and UV Damage
Ultraviolet radiation accelerates collagen and elastin breakdown through a process called photoageing. The nose and surrounding areas receive significant cumulative UV exposure, particularly in people who spend time outdoors without adequate sun protection. UV damage also impairs the skin's ability to repair itself, meaning that the micro-damage caused by repeated muscle movement is less efficiently corrected over time.
Smoking and Lifestyle Factors
Smoking reduces blood flow to the skin, depletes vitamin C (which is essential for collagen synthesis), and introduces free radicals that accelerate structural protein breakdown. Chronic dehydration, poor nutrition, high alcohol intake, and disrupted sleep can each contribute to reduced skin quality and faster fine lines deepening, though the evidence for individual lifestyle factors varies in strength.
Genetics and Facial Structure
Some people are genetically predisposed to more expressive facial movement, thinner skin, or earlier collagen loss — all of which increase the likelihood of developing visible bunny lines at a younger age. Facial structure also plays a role: the shape of the nasal bridge and the relative strength of the nasalis muscle vary between individuals and influence how prominently the lines appear.
Compensatory Muscle Activity After Botox Elsewhere
A less widely understood cause is compensatory nasalis overactivity following botulinum toxin treatment in adjacent areas. When the glabellar muscles (between the brows), the forehead, or the crow's feet area are relaxed with a neuromodulator, the nasalis muscle can become relatively more active as it compensates for the reduced movement in neighbouring muscles. This can cause bunny lines to appear or worsen in people who had not previously noticed them. The risk is higher when injection placement is not carefully planned or when doses in surrounding areas are excessive.
Dynamic vs. Static Bunny Lines: Why the Distinction Matters
Understanding whether your bunny lines are dynamic or static is important because it directly affects which approaches are likely to help.
| Feature | Dynamic Bunny Lines | Static Bunny Lines |
|---|---|---|
| When visible | Only during facial expressions | Present at rest and during expression |
| Typical age of onset | Can appear in the 20s and 30s | More common from the 30s–40s onward |
| Underlying cause | Muscle contraction; skin elasticity still adequate | Collagen loss, structural skin change |
| Response to skincare | May slow progression | Limited improvement from topicals alone |
| Response to neuromodulator | Good — relaxing the muscle removes the fold | Partial — muscle relaxation helps but collagen deficit remains |
| Additional treatments often needed | Usually not at this stage | Fillers, microneedling, or laser may be considered |
Dynamic bunny lines are a normal feature of expressive faces and do not necessarily require treatment. The concern arises when repeated folding, combined with declining skin elasticity, causes fine lines deepening into static creases. Early prevention — whether through skincare or timely professional intervention — is most effective before this transition occurs.
Preventing Bunny Lines: At-Home Strategies
No at-home approach can completely prevent bunny lines, particularly in people with strong genetic predisposition or highly expressive faces. However, a consistent routine can meaningfully slow their development and support skin quality over time.
Daily Broad-Spectrum Sunscreen
Applying a broad-spectrum SPF 30 or higher sunscreen every morning — including to the nose and nasal sidewalls — is the single most evidence-supported step for slowing photoageing. UV protection limits the collagen and elastin breakdown that makes skin less resilient to repeated muscle movement. Reapplication during prolonged outdoor exposure is important for sustained protection.
Retinoids and Retinol
Retinoids (prescription-strength) and over-the-counter retinol are among the most studied topical ingredients for stimulating collagen production and accelerating cell turnover. Regular use can improve skin texture and resilience over months of consistent application. The nose area can be sensitive to retinoids, so starting with a low concentration and applying sparingly around the nasal bridge is advisable. Results require patience — meaningful changes typically take three to six months of regular use.
Hyaluronic Acid and Moisturising Ingredients
Topical hyaluronic acid draws moisture into the skin and temporarily plumps the surface, which can make fine lines appear less prominent. Ceramides and other barrier-supporting ingredients help maintain skin hydration and structural integrity. While these ingredients do not rebuild collagen, well-hydrated skin is more resilient and tends to show expression lines less prominently than dehydrated skin.
Peptides and Vitamin C
Peptide serums signal skin cells to produce more collagen and may support skin firmness over time, though the evidence for specific peptides varies. Vitamin C (ascorbic acid) is an antioxidant that also plays a direct role in collagen synthesis and helps neutralise UV-induced free radical damage. Using a stable vitamin C serum in the morning, under sunscreen, addresses both pathways simultaneously.
Mindful Expression Habits and Protective Measures
Habitual nose scrunching — for example, when concentrating, reacting to smells, or squinting in bright light — adds to the cumulative muscle contraction that drives bunny lines. Wearing sunglasses outdoors reduces squinting-related nasalis activation and also provides additional UV protection around the nose. These are small adjustments, but over years they reduce the total number of repetitive facial expressions that fold the nasal skin.
Sleep Position
Sleeping face-down or on the side can press the nose and cheeks against a pillow, creating mechanical compression that contributes to facial line formation over time. Back sleeping reduces this compression, though it is not always practical and its specific contribution to bunny lines is difficult to quantify.
Avoiding Smoking and Supporting General Health
Stopping smoking — or not starting — removes one of the most significant accelerants of skin ageing. Staying well hydrated, eating a diet rich in antioxidants and collagen-supporting nutrients (such as vitamin C, zinc, and protein), and managing chronic stress all support skin quality, though none of these factors alone will prevent bunny lines in someone with strong genetic or muscular predisposition.
Facial Massage
Gentle facial massage and facial yoga are sometimes recommended to improve circulation and lymphatic drainage around the face. Evidence for their specific effect on bunny lines is limited, and overly vigorous manipulation of the nasal area could theoretically increase rather than reduce skin folding. If used, gentle upward strokes rather than compressive movements are generally suggested.
Professional Treatment Options
When at-home prevention is insufficient — particularly once static bunny lines are visible at rest — professional treatments offer more targeted options. The right approach depends on whether the lines are dynamic or static, their depth, and individual anatomy.
Botulinum Toxin (Neuromodulator) Treatment
Botulinum toxin — available under brand names including Botox, Dysport, and Xeomin — is the most established professional treatment for bunny lines. Small amounts of the neuromodulator are injected into the nasalis muscle, temporarily reducing its ability to contract and fold the overlying skin. For dynamic bunny lines, this can produce a significant reduction in the appearance of the wrinkles during expression. For early static lines, relaxing the muscle removes the repeated folding stimulus and may allow some improvement in the skin's appearance over time, though it does not directly replace lost collagen.
Results from botulinum toxin treatment for bunny lines typically last three to six months, after which the muscle gradually regains its activity and the lines return. Repeat treatment is required to maintain the effect. The dose used in this area is generally small, and the treatment is usually quick, though individual response varies. Possible side effects include temporary bruising, swelling at the injection site, and — if placement is not precise — unintended effects on nearby muscles such as those controlling the upper lip. This is why treatment in this anatomically complex area should be performed by an experienced injector with a thorough understanding of nasal anatomy.
Preventive Botulinum Toxin for Early Lines
Some practitioners offer early prevention treatment — using small doses of neuromodulator to reduce nasalis activity before dynamic lines have progressed to static ones. The rationale is that limiting the repetitive folding stimulus during the years when collagen loss is accelerating may slow the transition from dynamic to static wrinkles. This approach is a matter of individual clinical judgement and personal preference rather than a universal recommendation, and a qualified practitioner can help assess whether it is appropriate for a given patient.
Preventing Botox-Induced Bunny Lines
For patients already receiving botulinum toxin treatment for glabellar lines, forehead lines, or crow's feet, proactively discussing the nasalis muscle with the treating practitioner is worthwhile. An experienced injector will assess whether the planned treatment pattern is likely to increase compensatory muscle activity in the nasal area and may include a small preventive dose to the nasalis as part of the overall treatment plan. Choosing a practitioner who performs a thorough facial assessment before injecting — rather than treating each area in isolation — significantly reduces the risk of developing compensatory bunny lines.
Dermal Fillers
For static bunny lines with an element of volume loss or skin laxity, hyaluronic acid dermal fillers (such as those in the Juvederm or Restylane ranges) may be considered. Filler can add subtle volume beneath the line, reducing its depth. The nasal area requires careful technique because of the proximity of blood vessels, and this treatment carries a higher risk profile than filler in some other facial areas. It is typically considered as a complement to neuromodulator treatment rather than a standalone option for bunny lines.
Microneedling
Microneedling uses fine needles to create controlled micro-injuries in the skin, stimulating collagen stimulation and remodelling. It can improve overall skin texture and may reduce the appearance of fine static lines over a course of treatments. Results are gradual and multiple sessions are usually required. Microneedling does not address the underlying muscle activity that causes dynamic bunny lines, so it is most useful as a skin quality treatment rather than a primary bunny line intervention.
Laser Resurfacing
Fractionated laser treatments deliver targeted energy to the skin to stimulate collagen remodelling and improve surface texture. They can be effective for fine static lines and overall skin quality around the nose. Downtime varies depending on the laser type and intensity used, ranging from minimal redness to several days of recovery for more ablative approaches. As with microneedling, laser resurfacing addresses the skin quality component of bunny lines rather than the muscular component.
Who Is Most at Risk of Developing Prominent Bunny Lines?
Certain factors increase the likelihood of developing noticeable bunny lines earlier or more severely. People with naturally thin or fair skin tend to show expression lines earlier because thinner skin has less structural buffer against repeated folding. Those with highly expressive faces — who habitually scrunch their nose, squint frequently, or have strong nasalis muscle activity — accumulate more repetitive folding over time. A family history of early facial wrinkling suggests a genetic predisposition to faster collagen loss. Significant cumulative sun exposure without adequate protection, a history of smoking, and previous Botox treatment in adjacent areas without nasalis consideration are all additional risk factors worth discussing with a practitioner.
When to Consider Professional Assessment
At-home skincare and lifestyle measures are appropriate as a first step and for ongoing maintenance. However, if bunny lines are visible at rest rather than only during expression, topical products alone are unlikely to produce meaningful improvement — the structural change in the skin requires a more targeted intervention. Similarly, if lines have deepened noticeably over a short period, or if you have noticed new or worsening bunny lines following Botox treatment elsewhere, a consultation with a qualified aesthetic practitioner is worthwhile. A practitioner can assess whether the lines are dynamic or static, identify any compensatory muscle activity, and recommend a treatment plan proportionate to the concern.
Frequently Asked Questions
Are bunny lines a sign of ageing?
Dynamic bunny lines can appear in people in their twenties and are a normal feature of expressive faces rather than a definitive sign of ageing. They become more associated with ageing when they transition into static lines visible at rest, which reflects cumulative collagen loss and skin elasticity decline over time.
Can Botox cause bunny lines?
Yes. Botulinum toxin treatment for glabellar lines, forehead lines, or crow's feet can trigger compensatory nasalis overactivity, causing bunny lines to appear or worsen. This is more likely when injection placement does not account for the balance of facial muscle activity. An experienced injector will assess this risk and may treat the nasalis proactively as part of a broader facial treatment plan.
At what age do bunny lines typically appear?
Dynamic bunny lines can be visible in the mid-twenties in people with expressive faces or thinner skin. Static bunny lines — present at rest — more commonly develop from the mid-thirties onward, though this varies considerably depending on genetics, sun exposure history, and lifestyle.
Are bunny lines permanent?
Dynamic bunny lines are not permanent in the sense that they disappear when the face is at rest. Static bunny lines represent a more lasting structural change, but they can often be improved with appropriate professional treatment. Neither type is entirely irreversible with the right approach, though deeper static lines may require ongoing maintenance rather than a single treatment.
How many units of Botox are needed for bunny lines?
The dose required varies between individuals depending on nasalis muscle strength and the extent of the lines. Providing specific unit numbers is not appropriate here, as dosing decisions should be made by a qualified practitioner following a face-to-face assessment. The dose for bunny lines is generally small relative to other treatment areas.
Can skincare alone get rid of bunny lines?
For early dynamic bunny lines, a consistent skincare routine — particularly retinoids and broad-spectrum SPF — may slow progression and support skin quality. For established static bunny lines visible at rest, topical skincare alone is unlikely to produce significant improvement. Professional treatment is generally needed to address the muscular and structural components of deeper lines.
Making an Informed Decision About Bunny Lines
Bunny lines are a natural consequence of facial expressiveness and ageing, and some degree of nasal wrinkling is entirely normal. Not everyone who develops them needs or wants treatment, and that is a reasonable position. For those who do wish to address them, the most effective approach depends on the stage of the lines: early dynamic lines respond well to consistent sun protection, retinoids, and — if desired — small doses of botulinum toxin; established static lines may benefit from a combination of neuromodulator treatment, skin-quality interventions such as microneedling or laser, and occasionally dermal filler.
The most important practical step for anyone considering professional treatment is to consult a practitioner who assesses the face as a whole rather than treating individual areas in isolation. This is particularly relevant if you are already receiving Botox in other areas, where the risk of compensatory bunny lines is real and preventable with careful planning. A thorough consultation will clarify whether your lines are dynamic or static, identify any contributing factors, and help you understand which options are proportionate to your concern and realistic in terms of results.
