Not sure but can be from fluke infections. Can treat with prazaipro. Should post ur water parameters and tank info. The aro in question looks a little off. Maybe just the photos or my own eyes.
I answered this question about your fish many months back - truth is no one can tell from some pics posted on the internet. As far as black spot disease ....
yes.I used prazipro last time, and I thought it have TB. now I dont know if it have TB since I saw every1 that their fish have TB always die and its 6 month and my fish didn't die yet. seems like treating with prazipro makes the fish better but I stopped after 1 month and seems like it got more black spot after not using prazipro