Bettaowner14
Could be, what are your perimeters? I would just keep an eye on it and see if it spreads, it’s too soon to know for sure I think. It’s difficult to tell from the pics, could it be he just scratched a scale off? Mine does that all the time.
Could be. Or could be an injury. Or a scale. One spot doesn't tell us much. Has long has it been there?
When you start getting more than one spot, that's when to be concerned. Right now just watching for more probably is the best option.