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My dog's clear, fluid-filled head bump is growing. What is it?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 12 years and 5 months old | 16 lbs

He's been seen by a vet for the bump on his head.There was no concern & she was able to drain.He has sensitive skin & allergies so I think it's related.She ok'd to drain at home which I've done multiple times & he never reacted like it hurt.It was easy.It's filling faster,getting bigger,& it's like the skin is thicker because it's harder to pierce so he tries to run!It's stressful for both of us!I'm getting it removed but is it a vesicle?Papule? Cyst?It's CLEAR,round,&filled w/water-like fluid.

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1 Answer

Most Helpful Answer

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Answered By Ana M, DVM

Veterinarian

Published on April 15th, 2018

Thank you for submitting your question regarding Max. I would suspect it is a cyst based on everything you have described. After it has been surgically removed, it can be submitted to a laboratory to determine an accurate diagnosis. It will be good to have it removed as it is growing and becoming more difficult to drain. I hope this information helps!

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