! (and a belated welcome to the forum too !)
This cat...does not seem to be the least bit bothered by this area, I have never seen ANY thing to believe that there is any discomfort or I would have brought her back to the vet months ago.
I think I've seen pictures of a type of infection that closely resemble what I'm seeing in your cat's picture....those pix were of a type of animal MRSA. MRSA in humans has its animal variations...the first time I saw it, it was MRSI....I've seen other references lately to MRSP. The only point is that these infections do come in different strains.
Now, this stuff's everywhere - it's on your and my skin and everyone else's. And, usually, it's harmless....unless/until the skin is broken and not sanitized soon enough to prevent this nasty from entering. IF this is what's going on, I wonder if it started with the spay incision site......
Anyways, maybe, maybe, maybe.....
Are you able to get her to the University of Florida College of Veterinary Medicine ? A few reasons for that suggestion:
- they have a Dermatology specialty there - so the best-of-the-best teaching new Vets and Vets gaining their Board Certification in Dermatology....and
- UF has a teaching hospital there....where you'll be able to access all of that...and
- these small animal hospitals usually have a special fund, accessible when costs are prohibitive...and
- I suspect it will be less expensive there than taking her through the usual process of seeing a Veterinary Dermatologist on your own...and
- She would be best served by a competent Dermatologist...whether/not she actually has this type of infection
Here is the UF vet college hospital Dermatology page:Dermatology » Small Animal Hospital » College of Veterinary Medicine » University of Florida
Make sure you check out their amazing video on the "About Us" page!
OK....this is the article that introduced me (7 years ago!) to the 'MRSA thing' in animals (look at the pictures of the dog's lesions in the slideshow first...then decide if the reading could be valuable): Superbug bites dog / Drug resistant staph infections aren't just for humans anymore - SFGate
There's one 'side' issue....has she ever been tested for FIV/FELV? (immune-supressed cats would be more susceptible...and, it's useful to know a cat's status anyhow)
Now, here's something else - to be put in your 'back pocket' - in that article is a link to another story of animal-MRSA where medical honey was used to treat a resistant infection. I'm not suggesting at all that you try this (lest that were to make diagnosis more difficult) but so that you're aware of it - perhaps, though, present it to whoever ends up treating her - it seems like a useful tool (pretty remarkable, too!)
You should start treating her as if she were infectious...I'd separate her from the others until you can have her seen - and, I'd be extra careful with hand washing/sanitizing in the interim.....but, don't get paranoid, you could loose 'balance'.
From reading your posts, I know she's one of six....but, which one? She cannot remain anonymous! (a pic of her 'better side' would be nice, too!)
I hope some of that may help.