Gel nail allergy (HEMA): symptoms, causes, and how a careful salon lowers the risk

If your fingertips have ever itched the night after a gel manicure, you are not imagining it, and you are not alone. Allergy to the acrylates in nail gels is rising, and in Europe HEMA is now part of the standard patch-test series. This guide explains what the allergy is, how to recognize it, what causes it, and what a careful salon can and cannot do about it.

The short answer: most gel nail allergies are reactions to acrylates, above all one called HEMA. They develop when uncured gel touches the skin, often after months of wearing gel without trouble. The signs are itching, redness and swelling around the nails. If it happens, stop gel and see a dermatologist, who can confirm it with a patch test. HEMA-free gel lowers one exposure, but it is not allergy-free.

What a gel nail allergy is

Gel polishes, builder gels, bonders and primers are made from acrylates and methacrylates, small molecules that link together into a hard film when they are cured under a lamp. The risk comes mainly from uncured product: before curing, they can trigger an allergy when they touch the skin.

The most important of these is 2-hydroxyethyl methacrylate, or HEMA. A 2023 clinical review in Contact Dermatitis describes it as the leading acrylate allergen in nails, and it was added to the European baseline patch-test series in 2019.

This is allergic contact dermatitis: your immune system learns to recognize the chemical, and later exposures trigger a rash. It is different from simple irritation, and different from the lifting and infection problems that come from poor technique.

How common it is

The numbers come from people who were patch-tested at dermatology clinics, so they describe patients with skin problems rather than everyone who wears gel. Even so, the trend is clear:

• United States and Canada: recent prevalence of HEMA allergy is over 3 percent among patch-tested patients, and most cases now come from nail cosmetics, in both consumers and nail professionals.
• Europe: 1.5 to 3.7 percent of patch-tested patients.
• Rising: in a seven-center European audit of 26,297 patients, nail-related HEMA allergy rose from 0.91 percent in 2016 to 1.98 percent in 2023, even after EU restrictions on HEMA in nail products. It was far more common in women (2.82 percent) than in men (0.34 percent).
• Mostly clients, not technicians: in Amsterdam, 67 women were diagnosed with nail-cosmetic allergy between 2015 and 2023. Ninety-seven percent reacted to HEMA, and 73 percent were consumers rather than nail professionals.

Symptoms to watch for

Where	What it can look like
Around the nails	Itching, redness, swelling or small bumps along the nail folds and fingertips
The nail bed	Redness, swelling and pain under or around the nail
Elsewhere	A rash on the hands, and sometimes the face or neck

The FDA lists redness, swelling and pain in the nail bed, along with skin irritation, among the reactions people sensitized to methacrylates can have. In the Amsterdam study, the fingers were affected in 79 percent of cases and the hands in 40 percent, with the head or neck next. People who post about it online describe itchy fingertips at night, or redness and small bumps around the nails.

None of this is a diagnosis. Several skin conditions look alike, which is why a dermatologist and a patch test are the way to know for sure.

What causes it

The British Association of Dermatologists and the research above point to the same risk factors:

1. Uncured gel touching the skin. This is the main route. A brush that floods the cuticle, a smudge on a finger, or sculpting product handled with bare hands all put uncured acrylates on skin.
2. Under-curing. Layers that are too thick, or cured too briefly, can leave uncured product in the nail.
3. A lamp that doesn’t match the gel. Gels are formulated to cure under particular lamps. The wrong lamp can leave product under-cured.
4. At-home kits. Dermatologists have warned that home gel and builder kits, used without training or a matched lamp, are a known risk.

Why it matters beyond your nails

An acrylate allergy doesn’t stay on your hands. The British Association of Dermatologists points out that the same or similar methacrylates are used in white dental fillings, enamel coatings, orthopedic bone cement, glucose sensors and insulin pumps. Someone sensitized by nail products may react to those later. If you are diagnosed, tell your dentist and your doctors.

Is HEMA-free gel the answer?

It helps, but it is not a guarantee. HEMA-free gels remove the most common allergen, which reduces one exposure. A 2024 review found that HEMA cross-reacts strongly with related methacrylates such as EGDMA and HPMA, and that sensitization to one methacrylate can extend to others. So a person already allergic to HEMA may still react to a HEMA-free gel.

There is also a labeling point worth knowing. The FDA says there are no federal standards or definitions that govern the use of the term “hypoallergenic”. A product or salon that calls itself hypoallergenic or “allergy-safe” is making a claim with no agreed meaning.

What the rules say

• European Union: since 2021, HEMA and di-HEMA trimethylhexyl dicarbamate in nail products are restricted to professional use, with the warnings “For professional use only” and “Can cause an allergic reaction” on the label.
• TPO: the EU banned the photoinitiator TPO in cosmetics from September 1, 2025, classifying it as a substance toxic to reproduction.
• United States: we found no federal ban on TPO in nail products as of September 2026.

How a careful salon lowers the risk

No salon can promise that you will never react. What a salon can do is reduce skin contact and make sure every layer cures properly:

• Keep uncured gel off the skin. Thin, controlled layers that stop just short of the skin at the cuticle and side walls, and any spill cleaned away before curing.
• Cure fully. Thin layers, cured for the time the gel maker specifies.
• Match the lamp to the gel. Use the lamp the system was designed for.
• Protect the technician too. The British Association of Dermatologists advises nail technicians to wear nitrile gloves and change them every 30 minutes, because latex and vinyl gloves give no protection against acrylates.
• Tell you what is in it. You should be able to ask which brands are used and get a straight answer.
• Offer a gel-free option. For anyone who has reacted, a manicure without acrylates.

At Melix, Melina works to keep gel off your skin, applies thin layers and cures each one fully. You can ask which brands she uses, and a natural Russian manicure with no gel is always an option. If you have reacted before, mention it in your request, and see a dermatologist before your next gel appointment anywhere.

If you think you are reacting

1. Stop wearing gel. Don’t add another layer or a fill on top.
2. Don’t pick or peel it off. Peeling takes layers of nail with it. Book a professional removal, filed rather than peeled, with acetone kept to the fingertips.
3. See a dermatologist. Ask about patch testing for acrylates. It is the only way to know which chemicals you react to.
4. Keep a note. The product names from your salon help the dermatologist choose what to test.

The good news: in the Amsterdam study, avoiding the products cleared the rash in 80 percent of people. The allergy itself is worth remembering, for your dentist’s sake as much as your nails.

Choosing what comes next

If a dermatologist confirms an acrylate allergy, the simplest route is to leave gel behind. A natural Russian manicure keeps your nails shaped and your cuticle line neat with no acrylates at all. If you are unsure whether you have reacted, send Melina a message before you book. The hygiene page explains how she works, and the price list includes every gel-free option.