One of the biggest misunderstandings I see in the lash industry is clients (and sometimes even lash artists) assuming that every red, itchy, irritated eye is a lash glue allergy.
The reality is that many of these cases are actually blepharitis, a very common eye condition that has absolutely nothing to do with the adhesive itself or the lash artist.
Understanding the difference is important because they require completely different approaches. If you mistake blepharitis for an allergy, you may end up blaming the wrong thing, recommending unnecessary glue changes, or continuing treatments when the client really needs to seek medical advice.
What is Blepharitis?
Blepharitis is a chronic inflammatory condition that affects the eyelid margins where the eyelashes grow. It cannot be permanently cured, but it can usually be managed very successfully with good eyelid hygiene and appropriate treatment.
There are two main forms:
Anterior Blepharitis
This affects the front of the eyelid where the lashes grow. It is often associated with bacteria, dandruff, oily skin, or skin conditions such as seborrheic dermatitis.
You may notice:
- Flakes around the lashes
- Crusting along the lash line
- Debris attached to the lashes
- Redness around the eyelid margin
Posterior Blepharitis
This affects the meibomian glands inside the eyelid, which produce oils that help keep the eyes lubricated.
Symptoms often include:
- Dry eyes
- Watery eyes
- Burning sensations
- Irritated eyelids
- General eye discomfort
What does Blepharitis look like?
As lash artists, we're often looking closer at our clients' eyes than anyone else. Because of this, we're usually the first people to spot that something isn't quite right.
Common signs include:
- Red eyelid margins
- Flaky or crusty build-up around the lashes
- Itching
- Watery eyes
- Dry eyes
- Lashes that appear stuck together
- Oily debris around the lash line
In many cases, the symptoms have been present for weeks, months, or even years before the client walks through your door.
How is this different from a lash glue allergy?
This is where a lot of confusion happens. A true lash glue allergy is an immune response to a component within the adhesive, usually cyanoacrylate. Unlike blepharitis, allergic reactions tend to appear after treatment rather than being an ongoing condition.
A genuine allergy often presents with:
- Swollen eyelids
- Intense itching
- Puffiness around the eyes
- Inflammation of the eyelids
- Symptoms that develop 12–48 hours after treatment
The key thing to remember is that allergies are usually linked to the treatment itself. Blepharitis, on the other hand, is generally an ongoing condition that exists whether the client has lash extensions or not.
What about sensitivity?
Sensitivity is different again.
A client with sensitivity may experience:
- Mild irritation
- Watering eyes during treatment
- Slight redness
- Temporary discomfort
These symptoms often settle fairly quickly once the fumes have dispersed. Unlike allergies, sensitivities do not involve the immune system and don't typically cause significant swelling.
Should you carry out a treatment?
If a client arrives with obvious signs of active blepharitis, my advice would be no.
Applying lash extensions, carrying out a lash lift, or performing any treatment around an already inflamed eye can make the condition worse and leave both you and your client in a difficult position.
Remember, we are lash artists, not medical professionals. We should never attempt to diagnose an eye condition, but we absolutely have a responsibility to recognise when something doesn't look right. If you're concerned, advise your client to seek guidance from a pharmacist, optician, or GP before proceeding.
What causes Blepharitis?
Blepharitis can be triggered by a number of factors, including:
- Poor eyelid hygiene
- Bacterial build-up
- Blocked oil glands
- Excess oil production
- Makeup residue
- Certain skin conditions
- Environmental factors
This is why aftercare and daily cleansing are so important, especially for clients wearing lash extensions.
Supporting clients with blepharitis
For clients who are prone to blepharitis, encouraging good lash hygiene can make a huge difference.
This includes:
- Daily lash cleansing
- Removing makeup thoroughly
- Avoiding heavy build-up around the lash line
- Following aftercare advice consistently
- Seeking professional medical advice when symptoms flare up
Not every irritated eye is a lash glue allergy. In fact, blepharitis is far more common than many lash artists realise and is frequently mistaken for an adhesive reaction. Learning to recognise the difference helps you make better treatment decisions, protects your clients, and prevents unnecessary blame being placed on products that may not actually be responsible.