Could also be Lymphocystis based on the description. Look it up and see if it looks similar. If it is; it's viral and not much you can do other than ensure good water quality and feeding etc., it's sort of like a wart, it will just go away on its own and is rarely fatal or anything although it can sometimes be contagious so sorta annoying that way but otherwise not a huge worry.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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