Have seen them with and with out dude...but havnt seen any develop so like what im mean is no matter what else happens and changes with an oscars colours the spot stays the same..like yeah it will get bigger with size but will ether have one or not from birth.
Had a look at your pics again and it looks like it always had one its just taken this long to get big enuff to see good.
its funny but mine change colours all the time but the spots always the same.
thets one nice oscar dude....jealous much...lots :

cheer: