It’s hard to tell from the pictures if this is fungal, a tumor with an additional infection of some sort, or parisitic. levamisole would be an option for a parasitic issue as well as almost any health concern; there was a
good thread recently about how it isn't disease specific medication, but boosts the fish's immune function, and helps them naturally fight off infection or illness.
Keep treating with your anti-fungal/parasitic. Do good thorough gravel vacuumings to get any fungus that has fallen off of the fish out of the tank and ensure the general water quality. It would also help to clean out your filter, but making sure you don't wipe out all of your helpful bacteria in the tank; i.e. if you have two filters, clean one at a time (search the forum if you need more clarification about this).
Keep up the good work. Your fish is lucky to have such a concerned owner.
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