Hi, whats is the progress with the diseases?
Wish I knew more of its signs and fish's symptoms to make a diagnosis but,
In my humble opinion, its looks like Ich. I have same "thing" going on with my fish. with One fish that has both ich and lymph. The reason I'm leaning more towards ich is because you state that the spots on the fins are translucent. If it was lymph, then it would have stayed visible while growing like a cauliflower.
Well, since you have been treating it over a week, can you update us with signs and symptoms again? if its gone? we know that it's ich, if its still there then its lymph bc its more difficult to treat.