Nice to see you back again, but I am sorry it is for the worries you suffer. So here is my 2 cents worth for all it's bail out value...
Blastomycosis is not easily transmittable from one animal to the other. To humans, and I imagine also, to other animals only possibly by a deep bite. If it were transmittable through saliva, being a bulldog owner we would have all been in deep trouble! There was no shortage of slobbers and drool in our world. When I dressed Gunner's gushing absesses that were FULL to bursting with Blasto, in the emergency of the situation, I forgot to don gloves or take any precautions as I sponged seemingly gallons of pure blasto ooze from her side. Though I had several scratches on my hands from gardening, I suffered no ill effects. Pretty lucky though. I would highly recommend anyone dressing blasto absesses or leisons to use gloves! So do your best, but try not to obsess over a lick or drink from a bowl. Our cat drank all the time from the same bowl as the dog and the dog had horrendous back wash! The cat's fine, annoying as all get out but fine.
The absesses sound strange. The timing and the look of them is really different. Maybe you should send a little sample off to MiraVista and see what is going on with that? They can test the urine for a blasto count and they can also test the blood to see if the medication is being as effective as it could be or if the dosage needs to be adjusted.
I am another one who would put my hand up to protest the use of steroids while being treated for blasto. It is almost like one is defeating the other. The antifungal attacks the fungus, but the steriods feed and strengthen the fungus.
We could do with a little input from Eva I think. Her baby Marge had eye involvement and she was successfully treated on fluconazole. I think she used steroids for a bit too but I don't recall how much or for how long.
Either way, something is up with Ish and it doesn't sound right. Please keep us posted. I'll be rooting for you!
Joyce