Itchy, swollen fingertips after a gel manicure are not just bad luck. For many clients and nail technicians, they are the first sign of an allergy to ingredients commonly found in gel and acrylic products. Two names come up again and again: HEMA and TPO. This guide explains what they are, why safer HEMA-free and TPO-free gel nail products matter, and how Artistry Academy’s nail studio in Kathmandu approaches product safety for clients and students.
What is HEMA?
HEMA (2-hydroxyethyl methacrylate) is a monomer used in many gel polishes, builder gels and acrylic systems because it helps products bond to the nail. It is also one of the most common causes of (meth)acrylate allergic contact dermatitis linked to nail products.
The risk comes mainly from uncured or under-cured product touching the skin. Once someone becomes sensitised, the allergy is usually lifelong. Dermatologists warn that it can also cause reactions to other acrylate-based materials later in life, including some dental and medical materials.
Signs of a reaction
- Itching, redness or swelling around the nails and cuticles
- Nails lifting or separating from the nail bed
- Rashes that appear elsewhere, such as the eyelids, face or neck, after touching the face
Anyone with these symptoms should stop gel services and see a doctor or dermatologist.
What is TPO?
TPO (trimethylbenzoyl diphenylphosphine oxide) is a photoinitiator: the ingredient that reacts to UV or LED light so gel hardens. The European Union classified TPO as a substance of concern for reproductive toxicity and banned it from cosmetic products, including gel nail products, from September 2025. Many brands have since reformulated with alternative photoinitiators.
Why “free-from” formulas matter
| Concern | Conventional gel | HEMA-free & TPO-free gel |
|---|---|---|
| HEMA sensitisation risk | Present when HEMA is in the formula | HEMA removed from the formula |
| TPO photoinitiator | Common in older formulas | Replaced with alternatives |
| Suitability for technicians’ long careers | Daily exposure over years | Reduced exposure to key sensitisers |
Nail technicians are actually at higher risk than clients, because they handle uncured product every working day. Choosing safer formulas is a career-length decision, just like posture, lighting and dust extraction.
Free-from is not risk-free
A HEMA-free label reduces one major risk, but other acrylates can still cause allergies. Safety depends on technique as much as the bottle:
- Keep product off the skin. Clean cuticle work and no flooding of the side walls.
- Cure fully. Use the lamp recommended for the gel system and the correct curing time. Under-cured gel is a major cause of sensitisation.
- Don’t mix systems. Using one brand’s gel under another brand’s lamp can leave product under-cured.
- Protect the technician. Wear gloves, avoid touching uncured gel and wipe spills immediately.
- Avoid DIY gel kits if you don’t know how to cure correctly.
Our approach at Artistry Academy
At our nail studio in Sohrakhutte, Kathmandu, we work with custom-formulated, HEMA-free and TPO-free professional nail products, and our students train with the same approach to product safety. Hygiene, correct curing and keeping product off the skin are taught as core technique, not as an afterthought, in both the 45-day Professional Nail Course (NPR 1,50,000) and the 5-day Master Nail Tech Course ($750) for international students.
Book a safer manicure on our services menu, compare acrylic vs gel extensions, or see what our clients choose in nail art designs in Kathmandu.
Frequently asked questions
What does HEMA-free gel polish mean?
HEMA-free gel polish is formulated without 2-hydroxyethyl methacrylate, a monomer that is one of the most common causes of allergic reactions to gel and acrylic nail products. Removing it reduces a major allergy risk for clients and nail technicians.
Why was TPO banned in gel nail polish?
TPO is a photoinitiator that helps gel cure under UV or LED light. The European Union classified it as a substance of concern for reproductive toxicity and banned it from cosmetic products, including gel nail products, from September 2025.
Can you still be allergic to HEMA-free gel?
Yes, it is possible. Other acrylates can also cause allergies. Correct curing, keeping product off the skin and using a matched gel and lamp system remain essential even with HEMA-free products.
Does Artistry Academy use HEMA-free nail products?
Yes. Artistry Academy’s nail studio in Sohrakhutte, Kathmandu works with custom-formulated, HEMA-free and TPO-free professional nail products, and students train with the same focus on product safety.
What should I do if my fingers itch after a gel manicure?
Stop having gel services and see a doctor or dermatologist. Itching, redness, swelling or nail lifting can be signs of an acrylate allergy, and continued exposure can make it worse.
Safer nails, professionally done
Book a manicure or nail extensions, or ask about our nail courses: call or WhatsApp +977-9708274017, email info@artistrynp.com, or visit Artistry Academy at Sohrakhutte Chowk, Kathmandu, open every day 10:00 AM to 7:00 PM.
