white spot on clown

Hi,
I have a false percula clownfish that I bought about a week ago. It
appears to be doing fine, and is very active, but just after I bought it, I
noticed a large white spot on its side. It looks like a large grain of
sugar. I've watched it really close, and it hasn't seemed to grow, and no
others have appeared, so I didn't know if this was ok? Does anyone know
what this might be? Or if I can try to remove it? Thanks -Chris