[What is the white object Protruding from my Fish]

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[What is the white object Protruding from my Fish]

I have a celestial pearl danio that has a white object protruding from it's side.  I observed for a while and it seemed that the white part came out or fell off and left somewhat of a hole in the side of her.  She does appear to be a bit bloated as well.  I am worried about the rest of my tank.  Any thoughts on what this could be?

  

I tried to add picture, but I'm not sure if I am doing it correctly.