Feline Pemphigus Foliaceus
Feline pemphigus foliaceus is an autoimmune skin disease. The cat's immune system, which should protect it against germs, mistakenly attacks the connections that hold together the cells in the skin's outer layer. These cells separate from o...
What is it?
Feline pemphigus foliaceus is an autoimmune skin disease. The cat's immune system, which should protect it against germs, mistakenly attacks the connections that hold together the cells in the skin's outer layer.
These cells separate from one another and form small, very fragile pustules that burst quickly and are replaced by crusts. This is why crusts are the main sign seen, and the pustules themselves are rarely observed.
The disease remains uncommon in cats, but it is the most frequent autoimmune skin disease they develop. It is not contagious.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Yellowish to brown crusts, sometimes thick, appearing in flare-ups.
Typical locations: the face (bridge of the nose, around the eyes), the inner and outer edges of the ears, the nose, and around the nipples.
The area around the claws is an important indicator: the skin surrounding the claws becomes crusty, and thick, white to yellowish material may be expressed when gentle pressure is applied. The cat may then limp or be reluctant to walk.
Itching may occur but varies greatly from cat to cat.
Many cats also show general signs: fever, lethargy, and loss of appetite.
The skin lesions often have been present for several weeks by the time the cat is brought to the veterinarian.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The exact cause of the immune system dysfunction is unknown in most cases.
Some medications can trigger the disease in a predisposed cat: any medication given in the preceding weeks should be mentioned to the veterinarian.
No particular breed or age group is clearly predisposed in cats.
No clear breed, sex, or age predisposition has been established in cats.
Recent medication use, which can sometimes act as a trigger.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian will examine where the crusts are located: the face, ears, base of the claws, and nipples can point toward pemphigus.
A sample taken from an intact pustule or from underneath a crust, examined under a microscope, shows characteristic skin cells that have separated.
A biopsy—a small piece of skin removed under anesthesia—confirms the diagnosis.
The veterinarian must also rule out similar-looking diseases, particularly ringworm, using a fungal culture: some ringworm infections produce lesions very similar under the microscope, and a treatment that suppresses immunity would make them worse.
A blood test is often done before starting treatment and then during follow-up to monitor it.
Treatment
Treatment relies on medications that suppress the immune system, usually corticosteroids, sometimes combined with or replaced by another immunosuppressant. The choice and adjustment are for the veterinarian to decide after diagnosis is confirmed.
Treatment starts at a high dose to clear the lesions, then is decreased very gradually to the lowest effective dose. Some cats may eventually stop taking it, while others need long-term treatment.
Regular check-ups, physical exams, and blood tests monitor how well the treatment is working and watch for side effects.
A bacterial infection of the crusts or claws may require an antibiotic.
If a medication is suspected of triggering the disease, it is stopped.
Never apply a steroid ointment or give a steroid tablet without veterinary advice, and never stop ongoing treatment abruptly: a flare-up or hormonal imbalance could result.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
There is no known way to prevent the disease from developing.
Once treated, following the treatment plan and attending regular check-ups is the best way to prevent flare-ups.
Always tell your veterinarian about any medications your cat has received recently.
Possible complications
Bacterial infections of the crusts and claw margins.
Flare-ups, especially when reducing or stopping treatment.
Side effects from immune-suppressing treatments: in cats, corticosteroids can for example promote the development of diabetes, which is why regular monitoring is important.
Weight loss and weakness in a feverish cat that stops eating.
When to see a veterinarian
Crusts appear on the nose, around the eyes, on the ears, or around the nipples.
The claw margins are crusted, or thick material is coming out at the base of the claws.
Your cat is limping or refusing to walk while its claws appear damaged.
Crusts return in episodes over several weeks.
Crusts are widespread and your cat has a fever, is depressed, or refuses to eat: seek care the same day.
Your cat on treatment is showing unusual effects: it is drinking or urinating much more, is depressed, or its lesions are returning.
Prognosis
Most cats respond well to treatment and recover healthy skin.
Some will be able to stop treatment, while others will need to continue at a low level; flare-ups remain possible and require continued monitoring.
The outlook is better when diagnosis is confirmed early and treatment is followed closely.
Frequently asked questions
How to distinguish pemphigus from ringworm or scabies?
Ringworm typically causes round, hairless patches and can affect other animals or people in the household. Mange causes intense itching from the start and spreads to other animals. Pemphigus typically affects the nose, ears, the area around the teats, and the base of the claws, often with fever or lethargy, and is not contagious. Only samples, including fungal culture and biopsy, can provide a definitive diagnosis.
Can my cat contaminate other animals or my family?
No. Pemphigus foliaceus is an immune system disorder specific to each animal: it is not contagious.
Can I use a cortisone ointment while waiting for my appointment?
No. Treatment started before diagnosis can skew the test results, and if the lesions are actually ringworm or an infection, it would worsen them. Wait for the veterinarian's opinion before any treatment.
Will my cat need to be treated for life?
Not necessarily. Treatment is gradually reduced to the smallest effective dose; some cats can stop it entirely, while others require ongoing low-dose maintenance therapy. The veterinarian decides based on regular check-ups.
References
Content reviewed by the TunisieVet editorial team · Updated 11 October 2026
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