a spot is a small structure it occurs in some oral or some skin infection
Small people have small spots, large people have large spots.
If it has white spots (tubilcles) on it's gill covers (cheeks) and along the front of it's Pectotral fins then it means it's a male fish :-)
Jupetier has the red spot It is a common and extremely powerful storm on Jupiter
There isn't any spots on Uranus.