Goldfish spot

[Danby]

Hi,
I’m looking for advice in diagnosing one of my goldfish, they have this white lump on their side that seems to have come up over the last two days, they are the only one in the tank with such a lump, I’m not sure if this is white spot, or how to treat him

he’s in a 250L tank that has a 30% water change every week

 

[JuiceBox52]

It's not ich (white spot)

 

[Danby]

It's not ich (white spot)

Any idea what it would be then?

 

[JuiceBox52]

Not sure. It looks like just scale coloration?

@Colin_T might be able to say for sure

 

[Colin_T]

it would help if I knew what spot you are talking about?