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What's this yellow fluid-filled bump under my puppy's armpit?

Updated On September 23rd, 2025

Pet's info: Dog | Staffordshire Bull Terrier | Female | 3 months and 14 days old

I have just noticed like a medium sized bump that is filled with some yellowish fluid under my puppy's right arm. Just worried of what it might be

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1 Answer

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on February 10th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! The area looks moist so it is likely a superficial skin infection or hot spot. I would wash the area with water and mild soap and apply a triple antibiotic ointment twice daily. The area does look a bit swollen so watch it closely. If there is no improvement over the weekend have her checked by your Vet Monday. I hope this helps!

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