Moderate severity

Pillow Foot (Plasma Cell Pododermatitis)

An uncommon immune-driven condition in which one or more of a cat's paw pads become soft, swollen and puffy — as if inflated like little pillows or cushions.

⚠️ Common symptoms

Soft, swollen paw pads that look puffy or 'over-inflated'A purple or violet tinge and criss-cross scaly lines across the padThe large central (metacarpal/metatarsal) pad most often affectedSometimes limping, licking the feet, or a pad that ulcerates and bleedsOften several feet involved at once, in an otherwise well cat

Plasma cell pododermatitis, affectionately nicknamed 'pillow foot', is an uncommon but very distinctive condition. Affected paw pads become soft, swollen and puffy, taking on the look of a cushion or a slightly over-inflated balloon. The large central pad of the foot is the usual target, and it is common for more than one foot to be involved at the same time.

The swelling is caused by the immune system: for reasons that are not fully understood, large numbers of plasma cells — the white blood cells that produce antibodies — accumulate in the pads. Vets have noticed that a fair number of cats with pillow foot also carry feline immunodeficiency virus, which is why FIV testing is a routine part of the work-up even though not every affected cat is positive. Diagnosis is usually confirmed with a small biopsy, since swollen pads can have other explanations such as injury or infection.

The good news is that the condition is often more alarming to look at than it is dangerous. Many cats show no lameness at all and the pads simply feel soft. Treatment centres on calming the immune response — doxycycline is a popular first step, with steroids or other immunosuppressants held in reserve — and the outlook is generally good. Only when a pad ulcerates, bleeds or fails to respond does surgery come into play.

🔍 Causes

The exact trigger is unknown, but pillow foot is considered an immune-mediated disease: the immune system floods the paw pads with plasma cells (antibody-producing white blood cells), which makes them swell. A notable proportion of affected cats also test positive for feline immunodeficiency virus (FIV), suggesting immune dysregulation plays a part.

🛡 Prevention

There is no known way to prevent this uncommon condition, since its cause is not understood. The most useful things an owner can do are indirect: keep cats FIV-protected by neutering and limiting fighting risk, and check the paws whenever you notice licking or limping so the problem is caught early.

💊 Treatment

Many mild cases are managed with immune-modulating medication — doxycycline (an antibiotic with immune effects) is a common first choice, sometimes alongside corticosteroids or other immunosuppressants. Some cats improve, relapse and improve again, and a few resolve on their own. Painful, ulcerated or bleeding pads, or ones that do not respond to medicine, may need surgical removal of the affected tissue. Because there is a link with FIV, testing for it is usually recommended.

When to see a vet: Have your cat seen if you notice swollen, spongy or discoloured paw pads, especially if the cat is licking its feet, limping, or a pad has cracked open and is bleeding. While pillow foot is rarely an emergency, swollen pads can also point to injury, infection or other disease, so an accurate diagnosis — often confirmed by a small biopsy — matters.

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⚕️ Medical disclaimer

  • This information is educational only and is not a substitute for veterinary advice.
  • Symptoms overlap between conditions — only a vet can diagnose accurately.
  • Never withhold treatment or self-medicate based on information found online.
  • When in doubt, call your vet. Early intervention almost always leads to better outcomes.

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