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Hi this is Dr. Hill. Please give me a moment to thoroughly read your question.
Please post the pictures. That would be very helpful.
Are you having difficulty posting the pictures?
Thank you for the pictures. Nice that you have them from initial and then 4 days later. So there is minor improvement. The injectable antibiotic she received is a repository antibiotic that stays in the system for 7 to 10 days. I would probably stop the topical quadritop ointment. It really gums up their hair and then with an e-collar she can't groom herself. It is an anti inflammatory and may not be doing very much. Can you clean the area with a gentle soap? It does not look like a pustule, so bacterial infection is not as likely. Is it only one site? Was she licking at it quite a bit before the e-collar? And how long has it been there?
When I see skin lesions in a cat, I worry about fleas, mites and ringworm. Do your vet to a skin scrape or a DTM culture for ringworm?
She is a young cat, but we can still see mast cell tumors too. An aspirate would tell us what cells are present and fine tune possibilities.
Sorry, Did your vet do a skin scrape or DTM culture.
My thoughts if it does not completely resolve in a week. Initial skin scrape, a DTM culture (for ringworm) and a fine needle aspirate are good starting points to diagnose. differentials being: ringworm, allergic reaction (food allergy, bug bite, environmental allergies), demodecosis (pretty unlikely), mast cell tumor, eosinophilic granuloma. IF you do not get answers from those diagnostics, then I would have a biopsy submitted to a dermatopathologist (not a regular pathologist, this needs to be specifically requested when set out). The biopsy should give you your answer if you get to that point. Washing the area and then doing a warm compress will likely make her feel better. I am not a big fan of ointments on cats because they just seem to get stuck in their hair and make them more uncomfortable. Please ask any follow up questions.
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