Why do my cat's chronic ear scabs only respond to steroid shots?

A biopsy of the skin should have given a better answer than the teeth were a problem. It can tell if it is an infection from an allergy or an immune disease. I would worry about a food allergy and consider changing foods to a hypoallergenic diet and see what the biopsy results suggest for further medicine

It sounds like you are doing a good job ruling out the usual causes of chronic skin disease. You have one more month before you will know if its food (it takes 3 months to reset the immune system). I would recommend ruling out hyperthyroidism (although this typically affects older cats). Otherwise environmental allergies would be the most likely cause. These can be to ANYTHING (house mites, dust mites, grass, pollen..etc). I think you guys are on the right track. Keep going and best of luck!

Ouch! Those are some major hot spots in that photo. I would recommend having Lili seen by your vet so the area can be clipped and cleaned and any medications such as pain or antibiotics can be given to help it heal a bit faster. I'd also keep Lili from scratching or pawing at it as this can introduce bacteria and more inflammation which can slow healing. If only Lili is affected and you're not noticing other issues like parasites, etc, it is possible there is an allergy underlying. She could be rubbing up against something causing the itchiness, or could have an ingredient allergy to something in her food (or a treat if the spots correspond with intermittent feeding of a treat or wet food). Other issues such as an underlying illness like an immune or metabolic issue can also cause scabbing and skin issues that affect only one cat in the household. A vet visit is a good option at this point both to treat the current scabs and to see if a food trial, allergy meds, or additional testing such as bloodwork to rule out any underlying health issues may be beneficial in finding the cause.

I would talk to your vet about doing a biopsy or a culture and sensitivity. The biopsy may be able to tell a different skin condition (underlying mange, fungal infection, etc) that may require different medications than just antibiotics and steroids. A culture and sensitivity may reveal a resistant bacteria that isn't responding to the current antibiotics. I hope this helps.

The discharge inside the ear needs to be cultured so you can know what is growing in the ear canal - what bacteria, yeast, etc. That way the vet will know what medication to use to get it to clear up. The ear may also need to flushed out under anesthesia. There must be an underlying cause. Cats typically don't get ear infections chronically like dogs. It is not likely to be a food allergy. More testing needs to be done.

I am sorry to hear about your kitty! If her ears have been checked by a vet to ensure there is no infection I would be suspicious she could have an allergy, either to a food ingredient https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4951526 (most often a protein source and not grain as so many pet food commercials would have you believe) or an allergy to something in the environment like pollen/dust/etc. https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4952664 . I would recommend bringing Chessie into the vet for an examination. This often requires at least a short course of medication to get the itching under control, such as a steroid, Atopica (cyclosporine) or Apoquel. The vet can discuss if a diet trial with a hypoallergenic diet is recommended and help you decide on the best diet for Chessie to try.

This presentation could be due to a trauma (autotraumatism) or localized spot of skin infection (likely to be caused by bacteria). A check up, appropriate disinfection and possibly antibiotics (oral, topical or in a shampoo formulation) are needed to solve the problem. Disinfection may be started at home with very diluted hibiscrub or betadine or salted water baths. Buster collar may be useful as well to avoid any scratching. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.