Help White Cottony Growth on Tail

[jvis0606]

My gold platy has a white growth on its tail, at first it looked like a cyst was was colorless, now it looks white and cottony on the one side. Fish is acting completely fine - eating and swimming around. What do I do? I will be on vacation starting tomorrow!!!

 

[Sasha]

Does his/her fins look ragged and torn?

 

[Sasha]

Sorry, I double posted!

 

[jvis0606]

nope, everything is fine aside from a single white lump.