Bunny lines are the diagonal wrinkles that appear across the nose when you scrunch or smile, driven by the nasalis muscle. Learn what causes them, who gets them, how to slow them, and how Botox (used off-label) softens them.
Bunny lines are the diagonal wrinkles that fan across the sides and bridge of the nose when you scrunch, smile, or squint, driven mainly by the nasalis muscle. Botox, used off-label here, relaxes that muscle to soften the lines for roughly three to four months.
Bunny lines are one of the smaller facial creases people notice, yet they generate outsized curiosity because they often appear alongside a warm, genuine smile. This guide explains what they are, the anatomy and habits that create them, who tends to develop them, and the realistic ways to soften or slow them. FDA status is stated plainly throughout: Botox is FDA-approved for frown lines, crow's feet, and forehead lines, but treating bunny lines on the nose is an off-label use. This page is educational and is not medical advice.
Bunny lines are the short, diagonal wrinkles that appear on the upper sides and bridge of the nose when you scrunch it, smile broadly, laugh, or squint into bright light. The name comes from the way a rabbit twitches its nose: the same scrunching motion that creases the skin. Most people see them radiating outward and upward from the bridge, sometimes fanning toward the inner corners of the eyes and occasionally onto the upper cheeks.
Like other expression lines, bunny lines begin as dynamic wrinkles, meaning they show only while the muscle is active and vanish when your face is at rest. Over years of repeated movement, and as the skin loses collagen and elastin, some people find the creases begin to linger even with a relaxed face; at that stage they are called static lines. Bunny lines are entirely normal and are not a medical problem. They are a cosmetic concern only, and whether to treat them is a personal choice rather than a health necessity. Understanding which type you have, dynamic or static, matters because it shapes which treatment is likely to help.
The primary driver is muscle movement. When you scrunch or wrinkle your nose, the nasalis muscle, a thin sheet of muscle running across the bridge and sides of the nose, contracts and pulls the skin upward and inward, folding it into diagonal creases. Neighboring muscles can contribute, including the procerus between the brows, the levator labii superioris alaeque nasi that lifts the upper lip and nostril, and the medial fibers of the muscle that circles the eye. Recent cadaver and ultrasound studies suggest the exact zone where bunny lines form may not sit over a single discrete muscle, which helps explain why results from injecting one spot can vary from person to person.
Aging compounds the movement. With time, skin produces less collagen and elastin, so it recovers less springily from each scrunch and the folds set in. Sun exposure is the single biggest preventable accelerant, because ultraviolet light breaks down collagen through photoaging. Repeated expression habits, squinting because of uncorrected vision or bright light, smoking, genetics, and skin type all speed the process. One notable cause is compensatory: when Botox relaxes the frown or crow's feet muscles, some people unconsciously recruit the nasalis more, which can make bunny lines appear or deepen after unrelated Botox treatment.
Almost everyone can produce bunny lines on demand simply by scrunching the nose, so their mere presence during expression is not a sign of premature aging. Whether they become noticeable at rest depends on how animated your expressions are, your genetics, your sun history, and your skin thickness. People with very expressive faces, those who smile with the whole midface, and those who squint often tend to notice them earlier.
Dynamic bunny lines commonly become visible from the late twenties onward, around the same period the first faint frown and forehead lines appear. Static bunny lines that persist at rest usually take longer, often surfacing from the late thirties into the forties and beyond, as cumulative sun damage and collagen loss catch up with years of movement. There is a specific subgroup worth flagging: people who already receive Botox for frown lines or crow's feet sometimes develop new or stronger bunny lines because the surrounding muscles are relaxed and the nasalis takes over more of the scrunching motion. If you have noticed nose creases appear only after starting Botox elsewhere, this compensatory pattern is the likely reason, and it is easily addressed at your next visit.
You cannot stop the nose from moving, but you can slow how quickly dynamic creases turn into permanent ones. Daily broad-spectrum sunscreen is the highest-value habit, because protecting collagen from ultraviolet damage does more over a lifetime than any single in-office treatment. Wearing sunglasses reduces reflexive squinting in bright light, and correcting your vision prescription removes another common trigger for nose and eye scrunching.
A consistent skincare routine helps at the margins. Topical retinoids, the most evidence-backed anti-aging ingredient, support collagen production and skin renewal over months of steady use, while antioxidants and good hydration keep skin resilient. Not smoking preserves collagen and small-vessel circulation in the skin. Becoming aware of habitual nose-scrunching, whether from allergies, glare, or expression, can modestly reduce how often the muscle fires. It is worth being honest about limits: skincare and lifestyle can delay and soften bunny lines, but they will not erase established static creases, and no topical product relaxes a muscle the way an injectable does. Prevention is a genuine strategy for younger or early-line patients, and a useful complement to treatment for everyone else.
Botulinum toxin (Botox and comparable neuromodulators such as Dysport, Xeomin, Jeuveau, and Daxxify) is the first-line treatment. A provider injects a small dose, typically only a few units per side, into the nasalis to relax the muscle so it stops folding the skin. This use on the nose is off-label: Botox is FDA-approved for glabellar frown lines, lateral canthal crow's feet, and forehead lines, but not specifically for bunny lines. Off-label does not mean unsafe or unusual; it means the manufacturer did not seek FDA approval for this exact area, and experienced injectors treat it routinely.
Other options play supporting roles. Dermal fillers are generally not appropriate for dynamic bunny lines and carry meaningful vascular risk in the nasal region, so most experts favor toxin here. Skin-quality treatments, such as topical retinoids, energy-based resurfacing, and microneedling (microneedling devices are FDA-cleared, not FDA-approved), can improve fine static crinkling and overall texture but will not stop the underlying muscle movement. For rare, stubborn static nose lines, small case reports describe targeted chemical peel approaches, but evidence is limited. The practical takeaway: for the classic scrunch-driven bunny line, a conservatively dosed neuromodulator is the most effective and best-studied choice, ideally combined with sun protection and good skincare.
| Cause or line type | Best-matched approach | FDA status |
|---|---|---|
| Dynamic scrunch lines (nasalis movement) | Botulinum toxin, few units per side | Off-label for bunny lines |
| Compensatory lines after frown/crow's feet Botox | Add small nasalis dose at next visit | Off-label |
| Fine static crinkling / texture | Retinoids, resurfacing, microneedling | Retinoids Rx, microneedling FDA-cleared |
| Deep static creases at rest | Toxin plus skin-quality treatments, results modest | Varies, mostly off-label |
| Prevention | Daily sunscreen, sunglasses, retinoid, no smoking | Not applicable |
After neuromodulator treatment, the nasalis gradually relaxes over three to seven days, with the fuller effect visible around two weeks. Once it settles, scrunching produces far less creasing, and many people find their bunny lines nearly disappear during expression. Static lines that were already set in at rest improve less completely, because relaxing the muscle removes the ongoing folding but does not rebuild the collagen already lost; those creases soften rather than vanish, and may need skin-quality treatments alongside.
Results are temporary. Most people see the effect last roughly three to four months before movement returns and a repeat session is needed to maintain smoothness. Individual duration varies with dose, metabolism, and muscle strength. Because the nasalis is small and sits near muscles that control the smile and lip, conservative dosing matters: skilled injectors aim to soften the lines while preserving a natural expression rather than freezing the midface. No honest provider can guarantee a specific outcome, and realistic expectations are that bunny lines are well-controlled, not permanently erased. If bunny lines appeared only after Botox elsewhere, adding a small nasalis dose usually restores balance and prevents the muscle from overcompensating going forward.
Bunny line injections are generally low-risk in trained hands, but the nasal midface is a delicate area, so provider skill matters. Common, temporary side effects include minor bruising, swelling, redness, tenderness, or a small headache near the injection sites. These usually resolve within days. Because the treatment is precise and low-dose, systemic effects are uncommon.
The most relevant technique-dependent risk is unintended spread of the toxin to nearby muscles. If it drifts to the muscles that lift the upper lip, it can cause a temporary asymmetry, a flattened or drooping smile, or difficulty with certain expressions until the effect wears off. Injecting too high or too centrally can affect other zones. All botulinum toxin products carry an FDA boxed warning noting that, rarely, the toxin's effect can spread beyond the treatment site, causing symptoms such as muscle weakness or trouble swallowing or breathing; serious spread from small cosmetic doses is very uncommon but is why product labeling flags it. Good candidates avoid treatment during pregnancy or breastfeeding, with certain neuromuscular disorders, or with an allergy to any ingredient. The single best way to reduce risk is choosing a licensed, experienced injector who understands nasal anatomy and doses conservatively.
Bunny lines are an inexpensive area to treat because they require only a few units of product per side. Pricing generally follows one of two models: per unit, where clinics commonly charge a set amount for each unit of neuromodulator, or per area, where the nose is billed as a small treatment zone. Because the dose is low, bunny lines are often one of the more affordable neuromodulator treatments, and are frequently added on to a frown-line or crow's-feet session for a modest incremental cost.
Several factors move the price: your geographic region and local market, the injector's training and credentials (a board-certified dermatologist or plastic surgeon typically charges more than a nurse injector at a high-volume medspa), the specific product used, and how many units your anatomy needs. Since results last only a few months, the honest way to think about cost is as an ongoing maintenance expense rather than a one-time fee, budgeting for roughly three to four sessions per year if you want continuous smoothing. Avoid choosing on price alone: deeply discounted injectables can signal diluted product or an inexperienced provider, and the nose is not the place to economize on skill. Ask for a clear per-unit or per-area quote before treatment so there are no surprises.
Consider booking a consultation if bunny lines bother you cosmetically, if they have started to linger when your face is relaxed, or if new nose creases appeared after you began Botox for frown lines or crow's feet. A consultation is also worthwhile simply to learn whether your lines are dynamic or static, since that determines whether a neuromodulator alone will help or whether skin-quality treatments should be added.
Choose a licensed medical injector: a board-certified dermatologist, a plastic surgeon, or a trained nurse or physician assistant working under qualified medical supervision. Ask how many units they recommend and why, how they will protect your smile, and what their approach is if any asymmetry occurs. A trustworthy provider will discuss that bunny line treatment is off-label, set realistic expectations about temporary results, and never pressure you or promise a guaranteed outcome. Seek prompt medical attention after any injectable if you notice spreading weakness, drooping beyond the treated area, or difficulty swallowing, speaking, or breathing, which are rare but warrant immediate care. If you are ready to move forward, the most important step is matching with a qualified, experienced injector near you who treats the nasal area regularly.
For scrunch-driven dynamic bunny lines, Botox is very effective and uses only a few units, so it is often affordable and satisfying. It is off-label on the nose but routinely performed. Results last about three to four months, so it is a maintenance treatment, not a one-time fix.
Because bunny lines need only a few units per side, they are one of the cheaper neuromodulator areas, often added to a frown-line or crow's-feet session. Price varies by region, injector credentials, product, and units used, and clinics bill either per unit or per area. Ask for a clear quote first.
Complications are uncommon in skilled hands but possible. If toxin spreads to nearby muscles that lift the lip, it can cause temporary smile asymmetry or drooping until it wears off. Bruising and swelling are the usual minor effects. Choosing an experienced injector who understands nasal anatomy is the best safeguard.
They can be. When Botox relaxes the frown or crow's feet muscles, some people unconsciously recruit the nasalis more when smiling, which can create or deepen bunny lines. This compensatory effect is common and easily fixed by adding a small nasalis dose at your next appointment.
Botox is preferred for bunny lines because they are movement-driven, and relaxing the nasalis stops the creasing. Fillers are generally not suitable for these dynamic lines and carry meaningful vascular risk in the nasal area, so most experts avoid filler here and reserve it for other concerns.