No i wouldn't till you no what it is, can you describe where it is abit more does it look like a rust colour, has the fish been flicking and rubbing or heavy breathing.
I didn't keep him, it was like a small brown indent so a scale or two were missing behind a front fin on the mid body, it was circular. He looked healthy otherwise.
Scales missing could off rub them off on a ornament or substrate, watch out for flicking and rubbing, the brown indent is a worry, could be a parasite.