Dead spot of black mass appears on OLED Watch screen

[pjarvi]

It's physical damage which occurred while the device was in your possession, Apple is not responsible for the cost of repair.

 

[Newtons Apple]

I also have blackspot on the Samé palace als the other watches, the glas is not broken And stil they say there was to match pressior on the screen. They Will not repair it in warranty

If water did this Apple should replace it. As long as your watch shows no damages and you did not go deep diving, the water intrusion is not your fault it is Apple's for not sealing the watch.