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Heh, the common name is Black-Banded Leporinus..not much help huh..sorry LOL
What do the black spots look like? Where are they located? Can you get a pic?
Chances are they are scabs. These guys get a bit quarrelsome amongst themselves in small schools and with those front teeth can do a little damage.
There is also something called "black spot disease" which is basically black spots caused by a number of different parasites. Some will die off by themselves, others need treatment. I hate to recommend treating until we're sure tho.