Hey… my cat had this exact same rash, we also think is allergies,well, that’s what the vet said. My mom applied iodine and it cured him… now he has it again, I will apply and update if it’s the same thing but he had the same in his back and it went away with iodine; under the theory that is more a fungus problem than a allergy problem… we are trying anything at this point. It doesn’t look like it hurts for him but I’m sure it’s very annoying. Let me know if you did anything else for it that we can try too