A gel nail allergy is a skin allergy to methacrylates, the liquid ingredients that harden into gel under the lamp, and skin clinics in Europe are finding it more often. The likeliest reason is exposure: more people wear gel, and more of them apply it at home, where wet product lands on skin and a home lamp may not cure it all the way. In Spain, 4.3% of 6,134 patients sent for allergy patch testing reacted to HEMA, the ingredient clinics use to test for the whole family. In Italy the share went from 1.6% to 2.7% over five years. Those figures describe people already seeing a dermatologist for a rash, so they aren’t the odds for everyone who gets a manicure. Doctors who write about it still call it a rare side effect of gel. It’s also one you can lower your chances of.
What’s in gel polish that skin reacts to
Gel polish is a liquid made of small building-block molecules called monomers. Under the lamp they link into long chains and the liquid turns into a hard, glossy layer. That’s curing, and our gel polish vs. regular polish comparison covers how it differs from polish that air dries.
The monomers in gel belong to a chemical family called acrylates and methacrylates. Two names come up most in allergy reports:
- HEMA (hydroxyethyl methacrylate, written 2-HEMA in the research).
- HPMA (hydroxypropyl methacrylate), a close relative that often cross-reacts with HEMA, meaning skin allergic to one tends to react to the other.
The same family shows up well beyond the nail salon: in acrylic nails, eyelash glue and hair extension adhesives, and in dental materials, medical adhesives and orthopedic materials.
Researchers point at the liquid stage. The small, unlinked monomers are the part that sensitizes skin, and they’re present whenever gel is wet or only partly cured.
How the allergy develops
Nobody reacts the first instant gel touches a nail. The allergy is a delayed one. Unlinked monomers get into the skin, the immune system learns to treat them as a threat, and after that it responds whenever they turn up again. Doctors call the learning step sensitization.
Two things make that step more likely, according to the papers below: liquid gel sitting on skin instead of on the nail plate, and gel that doesn’t cure completely, which leaves leftover monomers behind.
The reaction itself is slow. Clinics that test for it read the results two, four and seven days after the test goes on. It usually starts where the product was: the most common picture in the medical literature is a blistering, itchy rash on the fingertips and the skin folds around the nails. It can also turn up far from the hands. In a 2026 letter in the International Journal of Women’s Dermatology, doctors at a Sydney hospital described a 46-year-old woman who used a home gel kit once. Her skin burned around the nails about six hours later, and by the next morning she had a blistering rash on her hands, lips, face and neck. The polish contained HPMA.
That’s one patient. She already had hand eczema and a nickel allergy, and no patch test was done, so the diagnosis was the doctors’ best reading. It shows what a reaction can look like. It says nothing about how often one happens.
What the clinic numbers show
Two large studies in the journal Contact Dermatitis give the best count so far. Both relied on patch testing: small amounts of common allergens, HEMA among them, are taped to the skin, and a dermatologist checks for a reaction over the following days.
| Spain | Italy | |
| Who ran it | The Spanish contact allergy registry, 24 dermatology centers | A University of Perugia team with 8 dermatology clinics |
| Who was tested | 6,134 patients with eczema, 2019 through 2022 | 7,133 patients, 2019 through 2023 |
| Reacted to HEMA | 265 people, or 4.3% | 147 people, or 2.1% |
| Change over time | Not reported year by year in the summary | 1.6% in 2019, 2.7% in 2023 |
| What stood out | About 7 in 10 positives were judged relevant to the patient’s current rash | About 7 in 10 relevant cases came from personal use, not a job, and nail products were the source in 72% of those |
The Spanish study was published in 2024 and the Italian one in 2025. The Italian team reported no specific funding and no conflicts of interest.
The Italian paper adds two details. Women tested positive far more often than men, 2.7% against 0.6%. And the women with a relevant reaction got younger as the study went on: their median age was 50 in 2019 and 28 in 2023. The authors link that to younger women using more nail products, and to home kits, which they say have sold in greater numbers since the pandemic.
Work still matters. In Spain, patients exposed on the job had much higher odds of a relevant reaction, and nail technicians have long been the group dermatologists worry about. What the Italian data suggest is that the customer has joined them.
What those numbers can’t tell you
- They aren’t the general public. Everyone in both studies had been referred to a dermatology clinic for testing because of a skin problem. A 4.3% rate in that group doesn’t mean 4.3% of people who wear gel are allergic. Nobody has measured that.
- The rise isn’t nailed down. Italy’s increase was not statistically significant, which means chance can’t be ruled out. The rate also dipped to 1.0% in 2020, which the authors put down to the pandemic.
- “Nail products” is a wide category. The Italian paper counts artificial nails as a single source. It doesn’t separate gel polish from acrylics, a salon set from a home kit, or one brand from another.
- It’s two countries. Neither study included American patients, and products and rules differ here.
- These studies look backward. They count who tested positive. They can’t prove what caused a rise.
Why home kits get the blame
Europe tried to handle this with a rule. In 2020 the EU restricted HEMA in nail products to professional use, with a required warning that it can cause an allergic reaction. The Italian authors’ verdict is that the rule isn’t working: the rate of positive tests didn’t come down afterward, and they write that these products remain easy to buy online. They also point out that other methacrylates that cross-react with HEMA are common in nail cosmetics, and the rule doesn’t touch those.
Two details explain the worry about kits. The Italian paper cites an EU safety committee’s 2018 conclusion that HEMA is unlikely to sensitize when it goes only on the nail plate and cures quickly under the lamp. And the Sydney doctors warn that at-home kits may not cure gel adequately. Put an unpracticed hand and a weak cure together, and both of those conditions fail at once.
Habits that lower your exposure
- Keep wet gel off your skin. Leave a hair’s width between the polish and the cuticle. If gel touches skin, wipe it off before your hand goes under the lamp.
- Cure for the full time, with the lamp made for your gel. Mixing one brand’s lamp with another brand’s polish is a guess. Our at-home gel manicure guide walks through the steps.
- Paint thin coats. Thick gel doesn’t cure through.
- Don’t touch your face mid-manicure. The rash in the Sydney case reached the lips, face and neck.
- Stop at the first itch. Burning, itching or blisters around the nails after a gel manicure are a reason to take it off and not reapply. Soak it off; our safe gel removal guide has the method.
- Be extra careful with broken skin. The Sydney case involved existing hand eczema, and the doctors suggest a damaged skin barrier may raise the risk.
- Keep gel kits away from kids. The Italian authors note more reports of severe reactions in children.
If you think you’ve reacted to gel, see a board-certified dermatologist before your next manicure. Patch testing is how this allergy gets identified, and it’s worth knowing for certain: the Italian paper notes that people with a confirmed allergy need to avoid these compounds strictly, and should be cautious with dental and medical materials from the same family. Your dentist will want to know.
The lamp’s UV is a separate question. For that, see what UV nail lamps mean for your skin.
Does HEMA-free polish solve it?
Partly, and only for some people. HEMA-free means a gel is made without that one ingredient. It’s a reasonable choice if you’ve never reacted and want to avoid the ingredient the EU chose to restrict.
It is not allergy-proof. A gel without HEMA can still contain other members of the family, which the Italian authors say are common in nail products and cross-react with it. The gel in the Sydney case was flagged for HPMA, not HEMA. If you already have a confirmed methacrylate allergy, a HEMA-free label doesn’t make a gel safe for you. That’s a conversation for your dermatologist, with your patch test results in hand.
Lower-exposure ways to wear color
Beetles HEMA-Free Gel Base and Top Coat Set
About $9
Olive & June Instant Mani Press-On Nails, Iconic French
About $10
Prices move constantly, so we link to live listings instead of printing a number that is wrong by the time you read it. Links go to Amazon, which is where a referral gets credited.
imPRESS Bare but Better in Instinct is about $7, though the price changes often. It’s 30 short, nude pink nails with the adhesive already on the back, so there’s nothing to cure and no bottle of anything wet. Peel, press, done.
Beetles HEMA-Free Gel Base and Top Coat Set is about $9 for two 15 ml bottles. Beetles says both are formulated without HEMA. They’re real gel and need a UV or LED lamp, so every habit above still applies. A HEMA-free base and top don’t change what’s in the color between them; check that bottle too.
Olive & June Instant Mani in Iconic French is about $10 and packs 42 nails in 21 sizes, with glue in the box. One caution on press-ons in general: the Italian researchers list them among the nail cosmetics tied to these reactions, so treat nail glue the way you’d treat gel and keep it off your skin. More sets are in our press-on nails roundup.
Essie Nail Polish in Ballet Slippers is about $10, a sheer pale pink that dries in the air and comes off with ordinary remover. No lamp, no curing. Regular polish isn’t reaction-free either. The Sydney letter notes that it has its own, different allergens, and that no study has compared how often each type causes trouble.
Olive & June Gel Mani System Set with LED Lamp is about $85. Olive & June says its gel polish is HEMA-free, meaning formulated without hydroxyethyl methacrylate, and the set includes a five-finger LED lamp built for that gel, a peel-off base coat, a gel base and top coat, and the prep tools. A lamp and polish designed together take the guessing out of cure time. Our Olive & June gel kit review compares it with a cheaper kit and a pricier one.
If I Were You
If you’ve worn gel for years with no trouble, keep wearing it and tighten your technique: gel on the nail only, full cure, thin coats.
If you do your own gel at home, use one brand’s gel with that brand’s lamp, and consider a HEMA-free system the next time you restock.
If your fingertips itched, burned or blistered after your last set, stop gel, builder gel and acrylics and see a dermatologist. Don’t test the theory with one more manicure.
If you have hand eczema or very reactive skin, start with press-ons that use a pre-applied adhesive, or regular polish, and ask your dermatologist before trying gel.
If your teenager wants a gel kit, know that the women reacting in the Italian clinics got younger over the five years, and that the EU treats HEMA nail products as professional-only. Press-ons are the easier yes.
FAQ
What does a gel nail allergy look like?
The pattern described most often in case reports is an itchy, blistering rash on the fingertips and around the nails, sometimes with a rash on the face, lips or neck. Other skin conditions look similar, so a dermatologist needs to sort it out.
Can one manicure cause a reaction?
It has been reported. The Sydney patient reacted after a single use of a new home kit. That’s one case, in someone with existing hand eczema, so it shows what’s possible, not what’s typical.
Is HEMA banned?
Not outright. Since 2020 the EU has restricted HEMA in nail products to professional use with a warning label. In the Italian study, positive tests were higher in 2023 than in 2019, after that rule took effect, though the difference was small enough that chance can’t be ruled out.
Is builder gel or BIAB any different?
Builder gel is a lamp-cured gel too, so the same precautions apply. Our BIAB guide has the questions to ask a salon.
Is gel safer at a salon than at home?
Neither study compared the two. The Sydney doctors’ concern is that home kits may not cure gel adequately. In Spain, the patients with the highest odds of a relevant reaction were the ones who handle these products at work.
Bottom line
Gel allergy is real, researchers tie it to uncured liquid reaching the skin, and clinics in Spain and Italy are seeing more of it among people who wear gel for fun, not for work. The numbers come from patients who were already being tested for a rash, so they can’t tell you your own odds, and the upward trend isn’t proven beyond doubt. The habits cost nothing: keep gel off your skin, cure it fully, and stop at the first itch. If you’ve had a reaction, see a dermatologist before the next set. There’s more in our nails archive.
