It would be helpful to be a little more specific about the history of these lesions. e.g. started x # of days ago, both sides to begin with or not, smaller with progression or no significant changes since you first noticed. Fish is still eating, any other behavioral changes?What else is in the tank, given the fuzzy focus I am wondering whether this could be traumatic. If this is bacterial you are running a high risk by leaving this fish in the display. Any way you can set up a hospital tank? The nitrate level of 10, pre or post wc?