There probably will be no other symptoms. It could also be an internal infection, but that is doubtful. JPC should be available at your LFS, if not find prazipro and soak the food in it and feed to the fish. They might not like it but they'll probably eat it eventually, and it should work.
You can try prazipro in the water, but I've never tried this and don't see how it helps with internal parasites.