Hello Mcorbett. Here is a link to what is called a twin bar platty. The photo is from one of our members:
http://www.fishlore.com/fishpicture/...php/photo/9075 http://www.fishlore.com/fishpicture/...php/photo/9076 this is a Sunburst by the same member.
I can't say for certain that anything is wrong with your platy so hold on for more responses. It sounds like it could be natural coloring. It would have nothing to do with
ICH.
As for treatment for ICH. I would recommend to stop using the medicine. Some medicines can cause your cycle to crash. Raise your temperature in your tank to 84 degrees. Leave it there for two weeks. Do 2 gravel vacuums each week to remove the spores that fall off the fish and into the substrate. If you aren't currently using an air stone it would be a good idea to add one as warmer temperatures requires more oxygen. If indeed your fish do have ICH they will look like they've been sprinkled with salt.
Best wishes and please keep us posted.
Ken