My goldie had a tumor like thing a long time ago. It went away and most of the scales grew back but... in the middle there is no regrowth of scales. Just white. I was told they would grow back after a long time but its been about a year?

Hey guys my female betta lost a lot of scales when she had pop-eye. I noticed this little spot where her scales haven't seemed to grow back yet and there was some white in it... Is that a parasite or just a new scale? (I've noticed the scales growing back in are a white color) sorry about the...