Hi Frank, lets cover some basics. What is your ammonia? Do you have a cycled filter in the tank? Are you using prime when doing your water changes. Are you aging your water and why the temperature fluctuation from 81 to 86? Are you using cold water for your water changes?
Did the mark on the face of the fish in question arrive with the mark? This question is based on the first picture in your post. What much PP were you using and for how long. Generally PP is used at 2ppm for four hours?
Were you adding PP, API general cure and MB due to the mark on the nose of the fish? What else were you treating for?
I think you should stop all the PP, API general cure and MB so we can see where the fish are. The marks on the nose of the fish take time to fill it.
Pat