It could have flukes as well, flashing is definitive for some sort of skin irritation.I sort of thought scrapes would be impossible since I did not net the fish to move it to quarantine I used a fish trap so the fish was less stressed than chasing it with a net. What concerns me is the tang is flashing a bit. Maybe because of the infection and I am overthinking? Not sure, but the spots have me worried along with the flashing.
I’m not sure how you made the catch and transfer with the fish trap, but fish frequently get banged up dashing against the sides when you lift the trap.
Jay