Massive Lump On Brilliant Rasbora?

[krusetanks]

I have noticed in the past couple weeks that one of my brilliant rasboras has been growing a massive lump on its side/stomach. It has been growing for almost a month. The fish is eating normally and is still schooling with the rest. It sleeps normally and swims just a little crooked. Any ideas on what it is? I have been looking and can't seem to find any information on brilliant rasboras at all. I would like to cure the little guy if possible because he was one of my first fish. I added pictures. The lump is about the size of a small marble. It is very large on one side and barely noticeable on the other side. 
http/www.flickr.com/photos/90428002@N03/
 

 

[bluesword23516]

Here is link.  This also has links in the text that you can copy and paste into your searchbar.  I hope this helps!
 
http/en.allexperts.com/q/Freshwater-Aquarium-3216/Lump-fish-side-1.htm