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My dog has a swollen bump on his back leaking pus. What should I do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male

A few months ago, a skin colored bump came up on my dogs back. It looked like a mole. I asked the vet about it at his annual check up and hey said it was nothing. It kept swelling and leaking, and I thought maybe he scratched it. But now white pus comes out of it a lot. What should I do?

2 Answers

Most Helpful Answer

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Answered By Dr. Leigh, DVM

Veterinarian

Published on June 30th, 2017

It may be infected and he might need an antibiotic. The best thing would be to have your vet look at it again and prescribe an antibiotic. It could also just be removed so it doesn't swell and bother him again.

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1Pet Parents found this answer helpful

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    Answered By Angel Alvarado, LVT

    Licensed Veterinary Technician

    Published on November 14th, 2016

    It sounds like local irritation/infection. Have your vet examine your dog. Antibiotics may be indicated. A biopsy or aspirate can also be done to collect a sample for pathology. This could diagnose the cause as well.

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    1Pet Parents found this answer helpful

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