I have a 1.5 year old male Himalayan who has been having issues with his chin for about 7 months now. It started off with a little black build up on his chin that looked like acne so I didnt Pay much attention to it. It then started to get a lot worse to the point it looked like he had wet food cemented onto his chin. I took Him to the vet and they told me to change his bowls from stainless steal so I did And I’ve tried plastic, ceramic, glass, any kind of bowl you can get and that has not changed anything.
We went back to the vet and they were stumped on what it could be so he went on steroids to see if that would help and it did for a couple days and it came back worse. We then tried an antibacterial shot and that slightly helped but then came back worse again. Tried steroids once again and made no difference this time. We ran some tests and swabbed the chin and they concluded it was staff infection. So he was treated for that and it didn’t help at all. We then tried another antibacterial shot I believe It was and it cleared up completely. But it is now back again and just keeps getting worse. The chin is raw, red, bloody, black scabby looking things, and so so itchy for him. They have now said I should Try a different food but he is on the urinary s/o Royal canin because my other cat recently had a urinary blockage and I cannot afford to put them both of different vet foods. I do Not think it is a food allergy because I have Tried numerous different foods with him but I could Be wrong. I clean it daily with a medicated soap they gave me and it doesn’t do much except keep it clean obviously, it hasn’t helped it improve. Has anybody dealt with something similar or have any possibly ideas of what this could be?
I will try to Add images to the comments , it won’t let me add them to the post

2 days ago i noticed a big black scab on my cats chin, i am familiar with cat-ne (feline acne) and i have not noticed it on him previously. The scab was pretty large and when i looked at it today, he allowed me to touch it so im assuming it isnt causing him pain and it kinda just fell right off. However, now there is a big raw spot where the scab was. Its rather pink and i think i saw some clear and possibly some yellow fluid coming out of a couple spots. But at this point, he was uncomfortable and ran away so i couldnt get a better look. Anyone have any ideas? It just seemed like too big a scab to be acne..

Is cat acne usually painful for the cat? Do they scratch at it?