Well....
Jasper had - well, still sort of has, septicemia.
With that, he was VERY listless. he barely moved.
But, he was also swimming around in circles and he didn't even acknowledge that I was there. I have a feeling he probably doesn't have it or you'd be seeing bloody splotches under his skin - like big ol' bruises. Do you see those? And sometimes, you can't even see them until you do a water change and they get really pale and then the bruising becomes apparent. I'm not saying he doesn't have it but I bet he probably doesn't.
Do you have any photos of him you could put up?
I have a feeling that the spots you're seeing are probably just markings on him, but that's just a guess. Photos would be helpful.
As far as being listless, can you get some aeration in for him? do you have any way to do that?
How's his coloration? Has he lost any/much color lately?
ps - I think maracyn 2 is a good choice for you to be trying now, by the way. If it is septicemia, the M2 should take care of it. (it did w/Jasper, but it took 5 days til I noticed an improvement)...