TL;DR: A lump between your cat's toes causing a limp typically requires a veterinary exam within 24 to 48 hours, but immediate care is necessary if your cat shows signs of systemic infection like lethargy or foul odors.
What could be causing the lump between my cat's toes and why are they limping?
Finding a growth or swelling in the interdigital space (the area between the toes) can be concerning. Common causes include:
- Interdigital cysts
- Abscesses resulting from a puncture wound or bite
- Foreign bodies like grass seeds or thorns stuck in the skin
- Feline tumors such as mast cell tumors or squamous cell carcinoma
Because the skin here is sensitive and under pressure during walking, any inflammation typically leads to noticeable lameness.
How do I know if the lump on my cat's paw is a veterinary emergency?
The urgency level for a lump between the toes causing a limp is generally Medium. While it is rarely an immediate life-threatening emergency, it indicates significant discomfort. Follow these triage guidelines:
- Schedule a veterinary appointment within 24 to 48 hours for most cases.
- Seek immediate care if your cat is lethargic or refuses to eat.
- Seek urgent care if the lump is bleeding excessively or emitting a foul odor, as these are signs of a systemic infection or a more severe abscess.
How does taking a photo of my cat’s paw help the veterinarian with triage?
Capturing a clear, well-lit photo of the affected paw is an invaluable tool for veterinary triage. Digital images allow the veterinary team to:
- Assess the color, size, and texture of the lump without further stressing your cat.
- Determine if there is a visible foreign object, a draining tract, or signs of inflammation.
- Prioritize your appointment and prepare necessary diagnostic tools, such as fine-needle aspiration or specialized cleaning supplies.
Clinical Context (Merck Veterinary Manual)
An interdigital fibroma, a mass of fibrous tissue between the toes, may resemble a papilloma and cause lameness. If undetected early, it enlarges, spreading the toes, and tendrils grow upward between the first phalanges, causing severe lameness. Differential diagnoses should include an impacted or infected interdigital oil gland, which can also cause local cellulitis or abscess. Treatment for interdigital fibromas involves surgical removal, with the animal sedated and regional nerve blocks administered. Post-operative care includes antibiotic powder application and bandaging the claws closely together, with wiring of the toes together showing success in some field reports.
Chapter: Dermatology
Source: The Merck Veterinary Manual, 11th Edition (Page 1170)