Do you have any pictures? sometimes it's easier to identify what the problem is with pictures.
Yes, he did cut himself the other day. I just don't know if it got worst or if something else is going on.Maybe he cut himself or bumped himself against an ornament? That's the only thing I ca think of. does he have any tankmates?
I'll look for those.It sounds like the cut became infected and much like a wound becomes puss-filled when trying to heal, it's pushing the scales out. I would try to get him on an antibiotic soon to combat the infection. Any like Erythromycin, Tetracycline, Maracyn I or II, are great, KanaPlex is one of the better ones on the market since it's new which means it's just a little more effective than the older meds but if you can only get the other ones that's fine.
So the scales are raised only on his cheek, correct? No where else? Can you get a video of him at all?