Eyelash extensions are a popular way to get longer, fuller lashes without mascara. Applied well, many people wear them without problems. But because the glue and lashes sit right next to your eyes, they carry real risks, from allergic reactions to infections and lost natural lashes. Here is what to know before your next appointment.
Quick answer
- Main risks: allergic reactions to the glue, eye irritation, infection and damage to natural lashes.
- Remove them and see a doctor if you get eye pain, swelling, redness, discharge or vision changes.
- Choose a licensed, hygienic technician and ask for a patch test.
How eyelash extensions work
Single synthetic, silk or mink fibers are glued one by one to your natural lashes, usually with a cyanoacrylate-based adhesive. They last several weeks and fall out with your natural lash cycle, so they need regular refills.
Possible risks
1. Allergic reactions
The adhesive can contain chemicals, including formaldehyde-releasing ingredients, that cause allergic contact dermatitis. Symptoms include itching, redness and swelling of the eyelids, sometimes days after application. Reactions can get worse with each refill.
2. Eye irritation and injury
Fumes from the glue, or glue touching the eye, can irritate the surface of the eye and cause redness, burning and watering. Rarely, the cornea can be scratched or burned.
3. Infections
Poor hygiene, contaminated tools, or debris trapped at the base of the extensions can lead to eyelid infections (blepharitis), styes or conjunctivitis.
4. Loss of natural lashes
Extensions that are too heavy or long put strain on your natural lashes, which can cause them to break or fall out (traction alopecia). Repeated damage can lead to thinning that takes months to recover.
5. Dry eye
Some people find extensions make dry eye worse, and cleaning around them can be harder.
Warning signs: when to get help
Have the extensions removed by a professional and see a doctor or eye specialist if you notice:
- eye pain, or redness that does not settle within a day
- swollen, itchy or red eyelids
- discharge or crusting
- blurred vision or sensitivity to light
Do not try to pull extensions off yourself; you can tear out natural lashes.
How to reduce the risks
- Choose a licensed technician with a clean workspace who washes their hands and uses sterile tools.
- Ask for a patch test of the adhesive 24 to 48 hours before your first full set.
- Choose lighter, shorter lashes that suit your natural lashes.
- Keep your eyes closed during application, and ask for a fan to reduce fumes.
- Clean daily with a gentle, oil-free lash cleanser and a soft brush.
- Do not rub or pull at your lashes.
- Take breaks between sets to let natural lashes recover.
Who should avoid eyelash extensions?
- people with known allergies to cyanoacrylate glue or formaldehyde
- people with blepharitis, frequent eye infections or severe dry eye
- people who have recently had eye surgery (ask your surgeon)
- people undergoing chemotherapy or with very sparse lashes
Frequently asked questions
Do eyelash extensions ruin your natural lashes?
Not if applied correctly and given breaks, but heavy extensions and frequent refills can damage them.
Can I wear contact lenses with extensions?
Usually yes, but take extra care with hygiene. Some people prefer glasses while the glue sets.
Are lash serums safer?
Some prescription lash serums work but can have side effects, such as darkening of the eyelid skin. Use only products approved for eyelashes, and ask a doctor first.
This article is for general information and does not replace advice from your doctor or eye specialist. Last reviewed: November 2026.
Sources
- American Academy of Ophthalmology: Eyelash extension facts and safety
- AAO EyeWiki: Eyelash extensions
- US FDA: Eye cosmetic safety
- American Academy of Ophthalmology: Risks of eyebrow and eyelash enhancement
