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My Boston Terrier has a strange rash. Could it be from prednisone?

Updated On September 23rd, 2025

Pet's info: Dog | Boston Terrier | Female | 24 lbs

Any idea what this could be? Our dog is a Boston Terrier and 7 years old. She had a blood transfusion a couple months ago and has been on high doses of prednisone as well as Denamarin and Cyclosporine. This strange rash or infection appeared a few weeks and and antibiotics have not helped. The first photo is what it looks like now and the second photo was taken a few weeks ago.

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1 Answer

Most Helpful Answer

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Answered By Dr. B. DVM, DACVIM (Oncology)

Veterinarian

Published on April 15th, 2019

That is quite an unusual lesion. Has your vet consulted a dermatologist regarding that? Given the history of autoimmune disease and immunosuppressive medication options could include calcinosis cutis secondary to the steroids, a fungal (or atypical bacterial) infection, drug eruption, etc. There are higher risks for complications with certain drugs and for certain infectious agents in different parts of the country. Sampling is likely indicated (cytology or biopsy, culture) and i would definitely recommend getting the input of a dermatologist before it progresses. I hope this helps and thank you for using Petco Pet Education Center, formerly Petcoach!

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