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Why does my pet's ringworm look worse while on medication?

Updated on September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 14 years old | 11 lbs

Buttercup has ringworm and is currently on oral antifungal meds. The area looks flaky/crusty/dry skin peeling. Is it a sign the ringworm getting worse and he isn’t responding to the meds? Thanks.

1 Answer

Most Helpful Answer

Kevin Sanada, DVM

Answered By Kevin Sanada, DVM

Veterinarian

Published on January 28th, 2018

They can definitely look worse right before they get better. This happens when the body pushes out the old/diseased skin and hair while the new/healthy skin and hair grows in. Oral medication is very effective for ringworm and not prone to resistance like some bacterial infections, so I doubt it's getting worse. It's also a good sign if it's just the existing lesions that look worse; rather than there being new lesions. If new lesions are seen, then this would indicate that the treatment is not working and would require a recheck by your veterinarian.

I hope that helps and Buttercup gets better soon.
Vote Icon8Pet Parents found this answer helpful

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