Blepharitis in Cats: Why the Eyelids Are Red, Swollen or Crusty

By Dr Duncan Houston

Red or crusty eyelids may look like a simple skin irritation. If your cat is squinting, rubbing or keeping the eye closed, the eye surface may also be painful.

Blepharitis describes inflammation of the eyelids. It is a finding that needs a cause, rather than a diagnosis that automatically calls for one particular eye drop.

Quick Answer

Blepharitis can cause swollen, red, itchy or crusted eyelids and may occur with other eye disease. Infection, parasites, skin inflammation, eyelid shape and local growths are possible causes. A painful or closed eye needs same-day assessment; sudden vision loss, a cloudy eye or significant trauma is urgent.

Why do eyelids become inflamed?

Inflammation may begin in the eyelid skin or glands, spread from nearby tissue, or follow irritation. Fungal infection such as ringworm, mites, bacteria, immune-mediated disease and eyelid masses may need different investigations. A rolled-in eyelid can allow hairs to rub the cornea.

The Merck Veterinary Manual explains feline eyelid disorders and the link between eyelid position and eye-surface injury. Short-faced cats may have anatomical factors that make complete blinking or tear distribution less effective.

How urgently should you seek care?

What else could look similar?

Conjunctivitis affects the tissue lining the lids, while corneal ulcers affect the clear eye surface. Both can occur alongside blepharitis. Glaucoma, a foreign body or deeper eye inflammation can also make a cat squint. Do not assume a visible eyelid problem explains all the discomfort.

A lump at the lid margin needs assessment, especially if it changes the blink or persists. A recurring lesion should not simply receive the same leftover cream each time.

What will the vet check?

The examination assesses both eyes, eyelid edges, blinking, surrounding skin and vision. Fluorescein dye helps identify corneal ulceration. Tear testing and eye-pressure measurement may be appropriate. Skin samples, cytology, fungal testing or biopsy are selected according to the lesion.

VCA's feline blepharitis guidance describes why treatment depends on the underlying problem. A diagnosis of immune-mediated inflammation requires different management from infection or a structural eyelid defect.

When is it an emergency?

Go urgently if the eye becomes cloudy or appears injured, vision suddenly changes, pain is severe or swelling prevents normal closure. For chemical exposure, contact an emergency clinic immediately for instructions and prompt assessment. Do not delay while trying to identify a home remedy.

What can you do safely?

1. Prevent rubbing with a correctly fitted protective collar if your cat tolerates it.
2. Keep the cat indoors and away from dust, sprays and other irritants.
3. If advised, gently soften external crusts with clean damp material, without pressing on the eye.
4. Use only the medicines prescribed for this episode, with clean hands and without touching the applicator tip to the eye.
5. Attend the recheck, particularly when an ulcer or chronic skin problem is involved.

Common mistakes

Do not use human redness-relief drops, antiseptics, tea bags or essential oils around the eye. Avoid leftover steroid-containing eye medication until a vet has checked the cornea, because steroids can worsen an ulcer or some infections. Do not trim hairs beside a moving cat's eye with scissors.

Prevention and follow-up

Manage any confirmed skin condition, maintain cat-appropriate parasite control and follow a gentle grooming plan for facial folds or long hair. Recurrent irritation may need correction of eyelid anatomy. There is no single cleaning routine that prevents every cause.

Frequently Asked Questions

Is blepharitis the same as conjunctivitis?

No. Different tissues are involved, although both may occur together.

Does my cat need antibiotics?

Only if the assessment supports a bacterial problem. Other causes need different treatment.

Can I wait if the eye is closed?

A persistently closed or squinting eye suggests pain and should be assessed the same day.

Can it spread to other pets?

That depends on the cause. Ringworm or some parasites require household precautions; non-infectious inflammation does not behave the same way.

Treat the cause and protect the cornea. A small-looking eyelid problem deserves faster attention when pain or vision changes appear.

For more practical animal health information, explore ASK A VET™. Your own veterinary team can help tailor the next steps to your cat or dog.