Hi Fishboss, I just saw your visitor post; my email said you had messaged me, but that my pm inbox was full so I logged on as soon as I saw that. I've looked at the photos and right off the bat it looks to me like Chilodenella or Glossatella, however, I read the link that Slappy posted and that makes sense, too.
I've never kept Discus and they present many unique and complex fish keeping issues it seems. I've never seen a case of Discus Plague Slappy referenced, and this may be the issue here.
In that article it describes an illness caused by a virus, most of which we don't have meds for, but it does say that there will likely be secondary issues that can occur during this illness and that we need to address those as they may appear.
I'm not 100% sure that this is the Discuss plague, but I do think that proceeding with the treatments for Discus Plague as suggested in that article is a good idea.
Here's what I would do:
Daily 75% water changes, carefully matching the temperature.
Talk to the guy you bought them from to see if any of his other stock have come down with this. If his fish haven't exhibited these symptoms I would be suspicious that this is not Discus Plague.
Dose the tank daily, right after the big water change, with Marycn Plus and Melafix as Slappy suggested.
Try to find Metronidazole to have on stand-by in case they do not seem to be improving with the above mentioned treatment. It has effectiveness against gram positive and some gram negative bacteria, and would help if Chilodenella or Glossatella are present, too.
Dr. No, is one of our excellent disease experts here on AC that we haven't seen in quite a while, unfortunately, and he uses AquaZole, by Seachem, in cases that are potentially Chilodenella or Glossatella, along with bacterial infection. AquaZole is also metronidazole, but you can get just pure Metronidazole.
I have used Metronidazole often and successfully and it's a fixture in my fish medicine cabinet. I ordered pure Metronidazole from Petmountain.com, but there are other online sources. I would hope that you can find it locally and not have to wait for a shipment, but in the meantime do the big water changes and use Maracyn plus and Melafix, both of which I have used with success. Many feel that Melafix's usefulness is questionable, but I have used it and feel that it does help.
Clean water is the major player in helping the fish fight this off if it is Discus plague, and then addressing bacterial and parasitic secondary issues will be paramount, as well.