Hi Bob,
I’m wondering if your vet did any needle aspirations or other tests on the lumps or skin scraping with the hair loss. Allergies are one possibility but also problems like infections or parasites could be considered. You could ask for a referral to a specialist for a second opinion. If we’re looking at food allergies, it can take a full 8-12 weeks before any benefit is fully noted so don’t get too alarmed if your cat is comfortable and acting normally but continue to follow up with your veterinarian.
All the best,
Dr. Ryan Llera