01-01-2007, 04:29 AM
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Without a picture, that's near impossible to even guess. There are cysts that will grow on the fin rays of bettas, goldfish, and various other fishes... but, again, without a pic or being able to examine the fish, there's no way to know what it is.
The best advice I can offer is to keep an eye on it, and try posting your water params for ammonia, nitrite, nitrate, and pH for us to get a feel for the environment... also temp would help, too.
The more you can tell us about the situation and conditions, the easier for us to help you.
Happy New Year!