Bluespotted sunfish disease.

My Bluespots got TB a couple of years ago. I spent a ton of money of meds that I read had worked in some cases. They recovered, but occasionally would get sores on their heads... They reproduced during that time, so I guess they were dealing okay.
Recently they have all died off. Given that they were about 4 years old it makes sense. Now one of the offspring of these fish has a funky knob at the base of one of his pectoral fins. It is white with a little red around the fin and looks kind of bumpy.
I can't get him to stay still for a pic or to even see it clearly.
What are your thoughts?

It would be easier to determine/diagnose, with a reference picture if you could get one. Doesn't have to be a clear shot of the fish, just the infected part. My current guess is some sort of tumor, but I can't be 100% sure without a picture. Surely someone with more experience than me will drop by this thread and give you an answer. Does it happen to look like this by chance?

http://www.maine.gov...es/vol4is26.jpg

Edited by ErraticFishFinatic, 16 May 2012 - 10:52 AM.

Could be many things, but Mycobacteria is certainly a possibility. I have seen Myco-infected cichlids with a pinkish lump at the pectoral fin base, and sometimes they stop using that fin.