Hello there! It sounds like you've noticed a small wart-like mass at your cat’s vaccine injection site. It's understandable to be concerned, but let's break down what it might be.
Cats can sometimes develop small lumps or bumps where they’ve been vaccinated. Most commonly, these are benign reactions where the tissue becomes irritated and swells a bit. Often, these will shrink or disappear on their own over time. You can keep an eye on it by gently feeling the area every few days to see if it changes in size or becomes sensitive.
Another possibility, though less common, is an injection-site sarcoma, which is a type of tumor. While this sounds scary, not every lump will become problematic. Look out for signs like rapid growth, changes in texture, or if it's causing your kitty discomfort. If you notice any of these, it's important to have it evaluated by a vet promptly.
At home, make sure your kitty is comfortable and try not to touch the mass too much, which might irritate it. Keep monitoring her for any changes in behavior or appetite that could signal something else is going on.
If you’re worried or notice the mass growing or changing, it's best to consult with a vet. Booking a video consult through Dial A Vet can provide peace of mind and guidance on the next steps.
Clinically Approved Standard by Dial A Vet Veterinary Team
Disclaimer: The customer and expert messages presented herein may have been altered with artificial intelligence or modified to enhance readability and safeguard the privacy of individuals. This content is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is experiencing a medical emergency, contact your local veterinarian or emergency animal hospital immediately. Talk to a vet now.

