When to see a vet urgently
Eyelid inflammation needs prompt examination if changes also suggest injury to the eye surface:
- Your cat keeps the eye closed, squints markedly or rubs constantly.
- The clear eye surface becomes cloudy or the eye looks clearly painful.
- Sight seems reduced or your cat bumps into things.
- An eyelid injury prevents normal eye closure.
Eyelid inflammation alone is rarely life-threatening, but corneal damage can threaten sight. You can find a vet near you.
Overview
The eyelids protect the eyes by spreading the tear film evenly and preventing corneal drying. In blepharitis, eyelid skin and lining become inflamed and thickened, with ulcers and crusts. Inflammation may be local or widespread and, in severe cases, extend to the conjunctiva and cornea, increasing complication risks.
Blepharitis differs from conjunctivitis alone. The conjunctiva covers the inner eyelid and part of the front of the eye, while eyelid inflammation also affects lid skin and margins. Several areas can nevertheless be inflamed in the same cat. The cornea is the transparent surface at the front of the eye.
Glands along the eyelid margin help lubricate the eye. Swelling or local inflammation may appear as a small bump. Not every eyelid lump is bacterial, however, because other tissue changes are possible. A persistent individual lump therefore needs separate examination.
Causes
Blepharitis can have several underlying factors:
- allergies to dust, pollen, insect bites or chemicals;
- bacterial infections involving staphylococci or streptococci;
- parasites, including Demodex, Notoedres and fleas;
- fungal diseases;
- eyelid injuries or mechanical irritation;
- systemic conditions, including atopic dermatitis and autoimmune disorders.
Eyelid structure can also sustain irritation. Entropion means the margin rolls inwards, making hairs rub the eye surface. It may involve congenital anatomy, scarring or marked squinting from eye pain. Simply wiping away discharge does not remove this mechanical problem.
Feline herpesvirus may be associated with recurring eye signs and chronic blepharitis. Some cases involve a local gland infection, tumour or immune-mediated skin disease. Similar redness can therefore require very different treatments.
Risk factors
- cats with allergic skin disease;
- kittens and elderly animals with weakened immune defences;
- outdoor cats and contact with stray animals;
- chronic eye or skin disease.
Information on the precise frequency and age-related risks of feline blepharitis is limited. Being a kitten or elderly does not itself mean weak immunity. Outdoor access may increase some skin and injury exposures, but indoor cats can also develop disease. Eyelid position changes associated with short-skulled anatomy can sustain irritation.
Symptoms
You may notice:
- red, thickened eyelids;
- itching and constant scratching around the eyes;
- hair loss around the eyelids;
- crusts and purulent discharge;
- eyelashes sticking together;
- eyelid swelling, with the eye partly or completely closed;
- light sensitivity and increased watering.
One or both eyes may be affected. Discharge varies from clear to mucoid or purulent. With prolonged disease, skin may lose hair or pigment. These changes alone do not reveal whether allergy, infection or another disease is responsible.
Tell your vet about itching elsewhere too. Facial hair loss and scratching, for example, may be part of broader skin disease. Localised Demodex problems may particularly affect the face, neck and eyelids. Itching varies, and little itching does not reliably exclude a parasite.
Possible complications
Untreated blepharitis can lead to:
- chronic inflammation and recurring episodes;
- corneal ulcers from constant irritation;
- reduced sight;
- spreading infection.
Repeated rubbing can worsen surface damage. A corneal ulcer means a defect in the outermost cell layer. If it becomes deep, perforation is possible, threatening sight and the whole eye. Do not delay examining a painful eye until the eyelid rash otherwise settles.
Not every eyelid inflammation impairs sight, however. The prognosis depends on the cause and whether the eye itself is already damaged. Recurrence may reflect lasting susceptibility or a skin disease needing treatment rather than automatically a new bacterial infection.
Diagnosis at the vet
Several investigations are used:
- a clinical examination of eyes and eyelids;
- samples and scrapings for bacteria, fungi or parasites;
- discharge cytology;
- allergy tests when an allergic cause is suspected;
- a tissue sample for chronic cases if needed.
The examination assesses lid position, closure and distribution of changes. The vet also checks the eye surface. Tear production may be measured, and fluorescein staining helps detect a corneal ulcer. Findings in eyelid skin and the eye surface together affect treatment choices.
Skin and discharge samples and culture if needed help investigate bacteria, fungi and parasites. Demodex mites may be sought in skin scrapings or hair samples. Different mite species have different lifestyles; Demodex gatoi, for example, can spread between cats. Mention other household cats' symptoms and contacts.
Allergy investigations are chosen according to the clinical picture; the list above does not mean one test identifies every allergic cause. Suspected food-related skin signs may require a planned dietary trial. Excluding parasites and other diseases causing similar signs also forms part of assessment.
A tissue sample may be needed for a suspected tumour or another unusual skin disease. Blood tests may be considered if no local explanation is found or other symptoms are present. Not every patient needs all these investigations in the same way.
Treatment and home care
Treatment targets the identified cause. Bacterial inflammation may need a topical antimicrobial, herpesvirus-related signs an antiviral, and allergic disease suitable inflammation control. Parasites require cat-appropriate treatment. The vet prescribes the product; one medicine does not treat every red eyelid.
An abnormal lid position or tumour may require surgery. If permanent anatomy causes rubbing, inflammation may recur while the irritant remains. Some underlying diseases can be managed even when they cannot be eliminated completely.
The vet may advise removing discharge and applying a warm compress to the lid. Ask for a demonstration of gentle handling. Do not rub a painful eyelid or force open a swollen eye. A protective collar may be needed to prevent rubbing when the eye surface is ulcerated.
Giving prescribed eye drops
Wash your hands before and after administration. Check the product name and method against your instructions because different bottles cannot all be used identically. Some need mixing. Ask the practice if you are unsure how to handle the particular medicine.
Your cat can be supported gently on your lap, with another person helping hold the head still. A towel may make handling easier. Keep the bottle tip away from the eye surface. Do not touch the eyelid or coat with it during administration.
Brief blinking or drooling afterwards may reflect the sensation of the drop or its taste after passing through tear ducts to the mouth. Persistent rubbing, increasing redness or clearly worsening discomfort differ: ask your vet for instructions before the next administration. Also report an inability to give the medicine in practice.
Response and recurrence
Watch whether swelling, discharge and itching decrease and your cat can hold the eye open normally. Corneal healing is assessed if needed alongside improvement in skin. A tidier external appearance alone does not confirm that eye surface damage has healed.
Monitoring recurring skin disease also considers the rest of the skin and grooming. Continuing scratching may mean allergy or parasites still sustain the damage. Photographs of progression and information on previous treatment response help follow-up. Sudden pain or cloudiness should not wait for a routine appointment, however.
Prevention
- regular veterinary check-ups;
- flea and other parasite control;
- hypoallergenic litter and care products;
- keeping the home clean;
- early treatment of skin and eye diseases.
This text provides general information and does not replace veterinary care. If your cat develops symptoms, contact a vet.
Frequently asked questions
Is blepharitis the same as conjunctivitis?
Not quite. Blepharitis inflames the eyelid, while conjunctivitis affects the conjunctiva on the eye and inner eyelid. They can occur together, and the cornea may also be damaged. Examination establishes which areas are involved.
Can another cat catch the same disease?
That depends on the cause. An abnormal lid position or allergy is not contagious, but some infections and parasites spread between cats. Investigation or treatment of other animals is planned according to the cause found.
Is wiping away discharge enough?
Cleaning may ease symptoms but does not remove an abnormal lid position, parasites or a tumour, for example. A painful or repeatedly inflamed eyelid needs examination. A closed eye, marked squinting and corneal cloudiness need prompt assessment.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Blepharitis in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Disorders of the Eyelids in Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Corneal Ulcers, Cornell University College of Veterinary Medicine, accessed 2026-11-03.
- Applying Eye Drops to Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Demodex spp., Companion Animal Parasite Council, accessed 2026-11-03.
- Feline Skin Diseases, Cornell University College of Veterinary Medicine, accessed 2026-11-03.