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My dog's tail sore came back, spreading, with a new painful bump. Why?

Updated On September 23rd, 2025

Pet's info: Dog | Silky Terrier | Female | spayed | 14 lbs

My dog had an infected sore in the crease (base of tail). Went to vet. They cleaned it and gave topical and oral meds. It got better but then started growing again. It's crusty, brown, painful, spreading. Today I notice a small grayish bump with reddening of skin around it. Also painful. What could this be?

1 Answer

Most Helpful Answer

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Answered By Dr. Leigh, DVM

Veterinarian

Published on November 20th, 2016

It sounds like he has a skin infection that needs to be treated again. Maybe he needed to stay on the antibiotics longer, either topical or oral. The bump could be related to the infection, a cyst, or a mass. It may respond to an antibiotic or your vet may need to biopsy or remove it to determine the exact cause. Please call your vet and schedule a recheck appointment. Hope he gets better soon!

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