Crow's Feet: Causes, Assessment & Treatment Options
Crow's feet are the lines that fan out from the outer corner of the eye when you smile, squint or screw up your face against the light. Nearly everyone has them, and two quite different things are happening within the same few millimetres of skin: a crease produced by the ring of muscle that closes the lid, and a change in skin that is thinner here than anywhere else on the face and has spent decades being folded and sun-exposed. Those two look like one line in a mirror, they need different answers, and most disappointment in this area comes from treating one while the other is what shows. This site is about working out which is at work at your own eye corner, whether anything needs doing at all, and what each option honestly changes.
Patient education reviewed by Tongchun Mao, MD. Lines that have appeared on one side only, a lid that has begun to droop, a brow that has fallen, or any change in vision should be assessed medically before anything cosmetic is considered.
Six things that put lines at the eye corner
The first three are the muscle story and the next three are the skin story, and most faces have some of both. Separating them is most of the decision, because a rung aimed at one does nothing for the other.
The muscle that both squints and closes the lid
The orbicularis oculi is a ring of muscle that encircles the eye. It is the muscle you use to squeeze the eye shut, and it is also the muscle you use to smile with the eyes. When it contracts, the skin lying over it has nowhere to go except into folds, and because the ring runs around the eye the folds run outward from the corner, roughly at right angles to the muscle fibres. That radial pattern is the fan.
The same fold, in the same place, thousands of times a day
A single squint leaves nothing behind. What changes the skin is repetition: the same crease forming along the same line every time you laugh, wince, read in poor light or step into the sun. Over years the skin accommodates to the fold, and a line that was present only in movement becomes faintly visible at rest. This is the part of the problem that no topical reaches, because the folding is mechanical rather than chemical.
A ring of muscle with an important job underneath it
The same muscle that makes the lines also pumps the tear film across the eye, protects the surface and helps drain tears away. That matters for expectations: treatment that reduces its pull has to leave enough function for the lid to close comfortably and for the eye to stay wet, which is why the effect is aimed at rather than maximised, and why the trade-offs at the brow and the lid are discussed before anything is offered.
Skin with almost nothing under it
The skin at the eye corner is the thinnest on the body, with very little subcutaneous fat beneath it and few sebaceous glands to keep it supple. There is no cushion to spread the force of a fold, so the same movement marks this skin earlier and more permanently than it marks the cheek. As the years pass the dermis thins further and loses the support that kept the surface smooth between movements, which is the point at which a line stays visible when the face is still.
Sun exposure across a lifetime
Ultraviolet light breaks down collagen and elastin in the dermis, and it does so most in skin that is thinnest and least protected. Sunglasses are worn by many people for comfort rather than protection, and the outer corner of the eye is a place where a wraparound lens or a hat brim rarely reaches. Photoaging is the main driver of the static, crepey part of the change, which is why protection is treated on this site as a genuine rung rather than as an aside.
Volume loss and the daily habits around the eye
As the temple, the upper cheek and the area just below the eye lose volume, the surface around the corner flattens and existing creases read deeper than they did. Alongside that, two ordinary habits add mechanical load: sleeping with the face pressed into a pillow, which folds the same skin for hours at a time, and rubbing the eye, which is common with allergy and dry eye and which stretches thin skin repeatedly. Neither is a cause on its own and both are worth removing before anything is bought.
When lines at the eye corner are not a cosmetic question
Almost every crow's foot is an ordinary consequence of moving the face and living in the sun, and the assessment is unhurried. A small number of changes in the same area are the visible part of something else, and the difference is made by how the change arrived rather than by how deep the line is. Lines appearing on one side only, or over weeks rather than years, is the finding that matters most, because the muscular and skin changes behind ordinary crow's feet are broadly symmetrical. A lid that has begun to droop, a brow that has fallen on one side, or a face in which one eye no longer closes fully belongs with a doctor rather than an aesthetic clinic. So does double vision, any change in vision, pain on moving the eye, or an eye that has become red, swollen or protruding. A new lump or swelling at the corner of the eye, a patch of skin that bleeds, crusts or does not heal, or a rash with blistering in the same area all need a diagnosis before any line treatment is considered. Weakness that is spreading elsewhere in the face or body, or a drooping lid that varies through the day, points away from the skin entirely and should be assessed promptly. Active infection, a cold sore or broken skin at the site is a reason to postpone treatment rather than a reason to worry, and a clinician will say so at the time. None of this means treatment is forbidden. It means the cause is established first and the timing is right, and where none of it is present the ordinary conversation about muscle lines, skin lines and what each rung changes can begin on a sound footing.
How the muscle line is told from the skin line
A photograph shows lines. It does not show how much of the line is the muscle folding the skin and how much is skin that no longer springs back, and the two take different routes. What separates them is a short examination and a few specific observations, and some of them change the whole plan.
The face at rest, then the face in movement
The area is looked at with the face completely still, and then while the patient smiles and squints. A line that disappears at rest is being made by the muscle and is described as dynamic. A line that remains visible when the face is still has a static component in the skin itself. Most faces show both, and the proportion is the single most useful thing the examination establishes, because it predicts how much of the line any one rung can reach.
The thickness and quality of the skin
The skin at the corner is lifted gently between two fingers and its thickness, elasticity and surface texture are noted. Skin that returns quickly and looks fine-grained behaves differently from skin that creases like paper and stays creased. Crepey texture, a loss of elasticity and fine cross-hatched lines that never disappear point to the skin component being the larger part of the problem, which changes what is worth offering first.
Sun damage in the surrounding skin
The clinician looks at the whole periorbital area and the upper cheek for the marks of accumulated sun: uneven tone, lentigines, a leathery texture and a loss of the fine line where the lid meets the cheek. Finding them here is evidence about what the eye corner has taken, and it changes the plan in a specific way, because a skin component driven by photoaging responds to protection and to surface treatment and not to anything aimed at the muscle.
Lid position, lid closure and the brow
The position of the lid edge is noted, along with how completely the eye closes, whether the lower lid sits snugly against the eye, and where the brow sits at rest and in movement. This is not an optional extra. A brow that is already low, a lid that is already loose, or an eye that is already dry changes what can safely be done at the eye corner, and each of the three is a finding that alters the plan rather than a footnote to it.
The history, and what it changes
The questions are about sun exposure and occupation, smoking, sleep position, allergy and eye rubbing, previous treatment in the area and when it was given, and whether the lines run in the family. Each answer moves something: previous treatment changes the anatomy and the timing, allergy and rubbing mean a mechanical load that survives any treatment, and a strong family pattern with early lines is a reason to be cautious about promising a large change. Photographs the patient brings are often more useful than the examination itself, because they show whether the lines are new or have always been there.
The ladder, from a hat to an operation
The rungs run from measures that cost nothing to operations, and what matters is not the order but the matching. Each rung answers one part of the problem, and a rung aimed at the wrong part is wasted at best. At the bottom sit the measures that reduce the daily load: sun protection worn every day rather than on bright days, sunglasses that actually cover the outer corner, sleeping on the back where that is possible, and stopping the habitual rubbing of the eye. None of these touches the muscle, and together they change how the skin component looks over months rather than weeks. The next rung is the skin itself: an eye-area moisturiser the lid tolerates, and a retinoid used carefully and sparingly near the lid, because the same agent that improves crepey texture on the cheek can irritate the eye corner and the eye surface. This rung works on texture and on fine static lines, and it does not remove a crease the muscle makes. Above it sits botulinum toxin of the A type, and it is the only rung that addresses the muscle: by reducing the pull of the orbicularis oculi, the crease flattens when you smile and the lines at rest soften because the skin is no longer folded hundreds of times a day. It does not remove the static change in the skin, and it carries trade-offs at the brow and the lid that are set out in their own guide. Filler sits above that, and it belongs to a different problem: a hollow at the eye corner or the upper cheek that makes existing lines read deeper than they are. It is not a treatment for a line. Then resurfacing, where non-ablative laser, microneedling and peel categories act on the skin component and are limited near the lid by how thin the skin is and how close the eye is. At the top, a temporal or midface lift addresses descent rather than lines, and belongs to a face where the tissue has moved rather than to a face with folds. Doing nothing is a legitimate answer at every rung, and for lines that are the ordinary result of decades of laughing and squinting it is often the honest one. One limit does not move with any rung: the muscle keeps working, so the fold returns to the same place every time you smile.
Four ways people make this worse
The first is to spend a year and a substantial amount of money on creams and devices for a line that is made by a muscle. A topical changes the surface of the skin and cannot stop a fold from forming, so the money buys a small change in texture and no change in the crease, and the delay is the only part of it that costs anything real. The second is the mirror image: to treat the muscle and then judge the result against a static line that was always going to remain, which reads as failure when in fact a different problem was being looked at. The third is to have volume placed into a line on the assumption that a line is a hollow. Filling a crease that is a fold adds material where the skin already folds, and the eye corner is one of the least forgiving places on the face for it: the skin is thin, the lymphatics are fine, and material that sits badly here is visible in a way it would not be on the cheek. The fourth is to reduce the muscle harder than the eye can tolerate. The orbicularis is not decoration; it closes the lid and moves the tear film. A result that leaves the lid unable to close comfortably, the eye dry and gritty, or the brow heavy and low is a result that treated an appearance and created a symptom, and it is the reason the effect is aimed at rather than maximised. None of these are rare, every one of them is easier to avoid at the start than to repair afterwards, and each begins with a treatment chosen before anyone said out loud whether this line was muscle, skin, or both.
If the decision moves toward treatment
This site deliberately stops short of describing procedures, because the techniques and the anatomy they work on are explained properly elsewhere in this cluster. The wrinkle-relaxing injections page covers the rung that acts on the muscle, and the surface rungs are described under fractional laser, which sets out what resurfacing near the lid can and cannot reach. The wider surgery of the upper face belongs with facial aesthetic surgery, the department that performs it is introduced on the Plastic Surgery and Aesthetics Medical Center page, and the assessment and technique are set out on Dr. Mao’s own site. Before any treatment, quality and surgical safety describes how safety is organised inside the hospital, and appointments explains how to arrange an assessment.
Crow's feet: causes and the treatment ladder
Possible causes on the left and the ladder on the right, from least to most invasive. Note which rungs act on the muscle and which act on the skin, and that no rung acts on both. The last line is the ceiling that none of them reaches.
Guides
Ten guides, ordered the way the question usually unfolds: what makes the lines in the first place, how the muscle component is separated from the skin component, what an examination looks at, and what each rung of the ladder can and cannot change.
Why Crow's Feet Form at the Eye Corner
The orbicularis oculi both squints and closes the lid. Why its contraction folds the skin radially, and why the same line returns to the same place every time.
Read the guide →Crow's Feet That Are Muscle and Crow's Feet That Are Skin
A crease that vanishes when the face is still and a line that stays are different problems. Separating them decides what any treatment can reach.
Read the guide →How a Clinician Assesses Crow's Feet
Rest, movement, skin thickness, sun damage, lid position and brow height: what each finding changes in the plan, and why a photograph cannot replace the examination.
Read the guide →The Thinnest Skin on the Face: Why the Eye Corner Ages First
No fat cushion, few oil glands and constant movement. Why the eye corner shows age before the rest of the face, and what that means for what treatment delivers.
Read the guide →Sun Damage at the Eye Corner
Photoaging drives the part of crow's feet that remains visible at rest: what ultraviolet light does to thin periorbital skin, and what protection changes.
Read the guide →The Conservative Rungs for Crow's Feet
Sunglasses that shade the corner, sleep position, lid hydration and retinoid tolerance: what the bottom of the ladder changes, and the part it cannot reach.
Read the guide →Know which line you have before deciding about it
An assessment of the eye corner takes a few minutes and answers the question everything else depends on: how much of the line is the orbicularis oculi folding the skin, and how much is the skin itself. You should leave knowing what each option changes, what it does not, and whether doing nothing is the reasonable answer for you.
Frequently asked questions
Do crow's feet need treatment at all?
Most do not. They are the ordinary mark of a face that has smiled, squinted and been out in the light for decades, and a great many people who ask about them decide, after an examination, that they would rather keep them. Treatment is a reasonable choice when the lines bother you enough to accept the cost, the appointments and the trade-offs, and it is not a medical necessity in any sense.
Why do the lines come back after treatment?
Because the muscle keeps working. Reducing the pull of the orbicularis oculi softens the crease and lets the skin recover between movements, but every smile and squint still folds the same skin along the same line. The effect of the muscle rung fades over months rather than years and the lines return gradually, which is what maintenance means in this area: not a cure held in place, but a change that is repeated.
Is there a cream that removes crow's feet?
No. A well-chosen eye-area product can improve the texture and hydration of thin skin, and a retinoid used carefully near the lid can soften fine static lines over months. Neither reaches a crease that a muscle makes, because the folding is mechanical. A product claiming to remove the lines at the eye corner is describing a change in the surface of the skin and not a change in the fold.
What is the difference between the line I see when I smile and the line I see at rest?
The first is made by the muscle and disappears when the face is still, and it is the part that responds to reducing the orbicularis pull. The second stays visible when the face is still, and it is a change in the skin itself: thinning, loss of elasticity and sun damage. Most faces have both, in proportions that an examination can estimate, and a plan that names only one of them leaves the other untouched.
Can crow's feet be treated without injections?
The skin component can. Daily sun protection, sunglasses that cover the outer corner, sleeping on the back, stopping the eye rubbing and a tolerated eye-area routine all change how the surface looks over months, and resurfacing categories act on crepey texture with a modest effect near the lid. None of them stops the muscle from folding the skin, so the crease that appears when you smile stays.
When should the eye corner be looked at by a doctor rather than a clinic?
When the change is on one side only or has appeared over weeks, when a lid has begun to droop or an eye no longer closes fully, when there is a new lump, an area of skin that bleeds or does not heal, double vision, pain on moving the eye, or any change in vision. Those findings put the question into a different category, and establishing the cause comes before any discussion of lines.
Part of Lines and Wrinkles — 9 sites on this topic