Why are my senior cat's crusty ears getting worse after antibiotics?

Question

Crusty ears on my 15 year old cat. Vet tested for mites-negative. Ring worm negative thus far. It was on her nose and chin but that cleared up. Antibiotic administered a week ago......yet ears worsen. I have photos. Pet's info: Cat | Mixed Breed | Female | spayed | 15 years and 3 months old | 6 lbs

Lauren Jones VMD · Accepted Answer

This sounds very frustrating! Mittens' ear crusts could be a result of a fungal infection (such as ringworm), bacterial infection from allergies, or vasculitis (from underlying systemic disease or immune compromise). If the final fungal culture is still negative, consider talking to your vet about performing blood testing to evaluate underlying organ function and a skin biopsy. Good luck!

Why are my senior cat's crusty ears getting worse after antibiotics?

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