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Is he anemic? I ask because he has an undiagnosed medical problem. The two could be related.

The vet did mention the possibility of doing blood tests.

And you probably want to minimize the steroid exposure, long-term side effects can be unpleasant for kittiboi (and you.) Coupla links:

Steroid Treatment - Effects in Cats
Side Effects Of Injectable and Oral Steroids In Cats

In a multi-cat household, fungal/bacterial pathogen identification can be somewhat easier - what (if anything) does he lick, lie/roll on, inhale or consume that the other kittehs do not lick/consume?

But allergen identification is harder with multiple kittehs, as you may need to feed him in isolation and/or prevent him from snitching the others' food/treats, while you do elimination diet trials.

Here's a good summary on cat allergies: Food Allergies in Cats

Also, do not forget to check possible environmental allergy triggers - I had one kittiboi who licked himself into an "Azerbaijani Poodle Cat" because (as we found out through much trial-and-error) he was exposed to a pine-based cleaning solution I used. Allergy triggers can be anywhere the kitteh is.

I'm not a vet, just a long-term kitteh parent who's seen several similar issues - of course you should always take a vet's advice first, but it doesn't hurt to gather information and be prepared with questions when you do see the vet!

helpfully,
Bright

Thanks!

It cleared up so fast, this time. I think the collar had a lot to do with that because he can't lick. This is absolutely the only thing that is a problem. His behavior, his litter box habits, his energy - all very much the same as usual. I think if it happens again, I'm just going to try the collar so I can have more information to give the vet.

I've been searching everywhere to see if there is something he's getting in to. I don't use a lot of chemical cleaners. I did buy a different 'odor control' litter so that is the only thing that's changed. I'm going to stop using it.

Meanwhile I'm buying a couple of different foods and will feed him in the den. I'd almost rather just make his food, myself. I'm going to start looking at what supplements I'd need to buy.

who keeps an eye out for him (head to....under the tail) and takes such good care of him. Sweet baby!

…cat that I am going propose “derrière dimple” instead of butt hole. Much more dignified -