A toenail that curls inward at the edges is usually reacting to how it is pressed and how it grows, not signaling serious illness. The right fix depends on whether the nail is simply digging into the skin beside it or the whole nail is changing shape, since those two problems call for different treatments. Most curled nails can be eased without surgery, and when surgery is needed, a small permanent procedure works for almost everyone.
Is It an Ingrown Nail or a Pincer Nail
People often mix up an ingrown toenail and a pincer nail.1PubMed Central. A Clinical Study of 35 Cases of Pincer Nails In an ingrown nail, the nail keeps a normal shape and only its edge cuts into the skin beside it.2PubMed Central. A Clinical Study of 35 Cases of Pincer Nails A pincer nail is different. It gets narrower and taller as it grows, curling like a tube or a trumpet toward the tip.3PubMed Central. A Clinical Study of 35 Cases of Pincer Nails The top and underside layers of the nail grow at different rates, which can make the far end curl inward more.4PubMed Central. Clinical Evidence for the Relationship between Nail Configuration and Mechanical Forces
You can check your own nail at home. Look at it end-on from the tip: a flat arc suggests an ingrown nail, while a tight curl suggests a pincer nail. Compare the width of the nail at its base with the width at the tip, since a pincer nail narrows toward the end. Then notice where it hurts: one red, swollen side points to an ingrown nail, and a pinching feeling from the whole nail points to a pincer nail. Check the other toes and the other foot too, because pincer nails often show up on both sides.
The difference shapes the treatment. An ingrown nail is a problem between the nail edge and the skin, so the fix aims at freeing the skin: lifting the edge, taping, or removing the offending sliver. A pincer nail is a problem with the shape of the whole nail, so the fix has to change how the nail grows or flatten it. Cutting out one corner can relieve a pincer nail briefly, but the narrowing and arching continue, and the pain usually comes back. Either type can be painless early on, so a nail can look clearly curled well before it starts to hurt.
A very thick, yellow-brown nail that grows long and curls like a ram’s horn is a third, separate problem.5DermNet®. Onychogryphosis It usually affects the big toenails, and the nail grows upward and bends toward the other toes.6DermNet®. Onychogryphosis
Pus, spreading redness or warmth around the nail suggests infection and needs prompt care. People with diabetes or poor circulation should have any nail pain checked quickly.
What Makes Toenails Curl
Tight, narrow shoes press on the inner edge of the big toenail.7Indian Journal of Dermatology, Venereology and Leprology. Ingrown toenails They also push the big toe against the second toe, which squeezes the outer edge too.8Indian Journal of Dermatology, Venereology and Leprology. Ingrown toenails The damage is gradual, and a nail can change shape over months of daily squeezing before the curl is noticeable. Shoes that are too short add another push, jamming the tip of the toe against the front and pressing up on the nail.
Trimming matters just as much. Cutting nails too short or rounding the corners is a common trigger for nails digging in.9Restore Foot & Ankle. Why Do My Toenails Curve Inward? The skin beside a short nail can fold over the edge, so the regrowing nail meets skin in its way. A leftover corner or sharp spike then grows into the flesh rather than over it. That is why digging out the corner yourself often makes things worse.
The shape of your foot plays a part. Many people’s big toes do not point straight ahead.10Family Podiatry Centre. Are Ingrown Toenails Really “Ingrown”? A bunion, where the big toe angles toward the others, is very common.11PubMed Central. Foot, Toe, and Nail Changes: Are They Interdependent?12PubMed Central. Foot, Toe, and Nail Changes: Are They Interdependent? A big toe that leans or twists presses one side of the nail harder than the other.13Family Podiatry Centre. Are Ingrown Toenails Really “Ingrown”? The toe can also rotate slightly, so one edge carries more load when you push off.
Flat feet may also make ingrown nails more likely, though the link is still being studied.14Family Podiatry Centre. Are Ingrown Toenails Really “Ingrown”? The big toe is usually the one affected because it carries most of your weight when you walk, and its nail is the widest, so side pressure changes its shape most. An old injury to that toe can also change how the nail grows.
Other causes are less about pressure. Fungal nail infection, psoriasis, lupus, a cyst near the nail and some medicines such as beta-blockers have been linked with pincer nails.15Upperline Health. Curled Toe Nails? All About Pincer Nails and Ingrown Toenails Pincer nails can also run in families, and in some families they start in early childhood.16CUTIS. Hereditary Pincer Nail
What You Can Do at Home
Strong tape can be pulled around the toe so that it draws the swollen skin away from the edge of the nail. One clinic taught this to 541 patients, and about half needed no other treatment.17PubMed Central. Patient-Controlled Taping for the Treatment of Ingrown Toenails It is worth trying first for both ingrown and curled nails.
To tape, clean and dry the skin so the tape sticks. Anchor it on the skin fold next to the sore edge, then pull it down and around the toe in a spiral. It should pull the skin gently away from the nail, not squeeze the toe. If the toe throbs or looks pale, take it off and redo it looser. Replace the tape when it loosens or gets wet, since damp tape holds moisture against the skin. If pain, pus or spreading redness appears despite taping, stop self-care and see a podiatrist.
Trimming comes next. Soak the foot in warm water for about ten minutes first. That softens a hard nail so clippers cut cleanly instead of splitting it, and it softens the skin at the nail edge, which can make mild tenderness easier to bear. Dry the foot well afterward, especially between the toes, since damp skin invites fungus.
Cut straight across with straight-edged clippers rather than curved ones, and leave the corners just past the skin. Rounding them removes the part of the nail that guards the skin, so the next growth can dig in. Smooth any sharp edge with a file instead of cutting deeper. Do not cut a V or notch into the centre of the nail; despite the folk advice, it does not relieve pressure at the sides.
Choose shoes with a wide, deep toe box and about a thumb’s width of space beyond your longest toe. Avoid high heels, which push the toes forward.
For thick nails, high-strength urea cream softens thickened nail and hard skin with very few side effects.18PubMed. Clinical evidences of urea at high concentration on skin and annexes A 40% urea product can soften and remove nail affected by fungus so antifungal treatment works better.19PubMed Central. Once Weekly Application of Urea 40% and Bifonazole 1% Leads to Earlier Nail Removal in Onychomycosis
Nail Braces That Flatten the Nail
A nail brace is a thin strip or wire fixed to the top of the nail that pulls the curled edges up. It needs no numbing and no recovery time, and you can wear your usual shoes.20PubMed Central. Ingrown toenails (unguis incarnatus): Nail bracing treatment Pain often eases right away.21PubMed Central. Ingrown toenails (unguis incarnatus): Nail bracing treatment
A brace can work on a nail that has already curled because it applies a constant gentle lift. The nail grows in a flatter shape over time instead of being forced back at once. It only holds its new shape once new growth comes through, which is why treatment takes months.
The evidence is encouraging. Adding a plastic strip brace after trimming the spike made ingrown nails come back less often over a year than trimming alone.22PubMed Central. Polyethylene Nail Brace for Ingrown Toenails Treatment: A Randomized Clinical Trial The brace also made the nail measurably flatter over that year.23PubMed Central. Polyethylene Nail Brace for Ingrown Toenails Treatment: A Randomized Clinical Trial In one small study of a clip-type brace, no one had the problem return a year after treatment ended, though other studies show some recurrence.24Applied Sciences. Evaluation of the Efficacy of the VHO-Osthold® Perfect Orthonyxic Buckle While Treating Ingrown Nails and Its Effect on the Clinical Picture of the Nail Apparatus
Fitting happens in a podiatrist’s office. The nail is cleaned and dried and may be filed on the surface. Some braces are glued-on plastic strips or wires that stay until the next visit. Others are small clips hooked under the nail edges and adjusted by the podiatrist. Which suits you depends on how thick the nail is and how severe the curve is. The brace is adjusted or replaced every few weeks as the nail grows.
Braces suit people who want to avoid surgery, and can be an option for those with poor circulation or diabetes, for whom cuts heal slowly, with their podiatrist’s guidance. They work best for mild to moderate curling, and very thick nails may need softening first.
While wearing one, keep the nail and brace clean and dry after washing, and follow your podiatrist’s advice on bathing and swimming. If the brace lifts, loosens or catches on socks, book a visit rather than pulling it off yourself, since tugging can tear the nail. Roomy shoes still matter, because tight ones can undo the lift.
When Surgery Is the Better Fix
In a phenol procedure, the doctor removes the problem edge of the nail and applies phenol, a chemical, to stop that edge from regrowing. One clinic reported success in 99.7% of patients over two years, with good cosmetic results.25PubMed Central. Treatment of Ingrown Toenail With Proximolateral Matrix Partial Excision and Matrix Phenolization Compared with other methods, it causes fewer recurrences, less bleeding and discharge, and less pain.26PubMed. Efficacy and safety of phenol-based partial matricectomy in treatment of onychocryptosis: A systematic review and meta-analysis That makes it the preferred surgery for moderate to severe ingrown nails.27PubMed. Efficacy and safety of phenol-based partial matricectomy in treatment of onychocryptosis: A systematic review and meta-analysis
It works because the nail grows from a root at its base. Trimming only the visible edge leaves that root making the same sliver again. The phenol procedure destroys the root cells at the problem edge, so a strip of the nail stops growing there for good and the nail ends up a little narrower. It also beats pulling out the whole nail: removing the entire nail without treating the root often lets the same shape regrow, while this procedure takes out only the troublesome edge, so the rest of the nail stays and protects the toe.
On the day, the toe is numbed with an injection. The procedure usually takes under an hour and you walk out afterward, though someone else may need to drive you home. Expect some drainage and dressing changes for a few weeks. Keep the dressing dry and clean and change it as instructed, since a damp or dirty dressing raises infection risk. Some clear or yellowish drainage is expected after phenol use, but increasing pain, spreading redness or pus is not, and should be reported. Wear open or roomy shoes during healing so nothing presses on the toe.
Severe pincer nails can be flattened by surgery on the nail bed.28PubMed Central. Anatomical Characteristics and Surgical Treatments of Pincer Nail Deformity Surgeons use a gentler cut for people over 70 and people with diabetes, kidney disease or poor circulation.29PubMed Central. Anatomical Characteristics and Surgical Treatments of Pincer Nail Deformity Before agreeing to surgery, ask whether a brace or taping is worth trying first, whether one or both edges will be treated, and how long healing will take given your health.
Keeping Curled Nails From Coming Back
If you have flat feet and have been given orthotics, wearing them may help prevent ingrown nails coming back by changing how pressure hits the toes.30Auckland Ingrown Toenail Clinic. How to Choose the Right Shoes to Avoid Ingrown Toenails Treating nail fungus early removes one cause of curling.31Upperline Health. Curled Toe Nails? All About Pincer Nails and Ingrown Toenails
After a brace or surgery, the nail may still need care for months while it grows out. The same pressures from shoes or toe shape can bring the curl back. Trim every few weeks, straight across. Even after a successful fix, cutting corners short or rounding them can bring the old pattern back.
Look at both big toes in good light once a week, checking for a new red edge, swelling, or a nail starting to arch. If you cannot see your feet well, use a mirror or ask someone to look, since early tenderness is easy to miss. People with reduced feeling in their feet, such as in diabetes, may feel no pain, so looking matters more for them. Return to the podiatrist at the first sign of digging in.
Rotate your shoes and replace worn-out pairs, and keep the toe box roomy rather than wearing the same tight pair every day. Socks that bunch over the toes can add pressure inside a shoe, so choose ones that lie flat.