my phone suddenly started having these white lines appear on my screen and i have no idea why. Until a few minutes ago it was completely fine! Screen was the proper resolution and everything worked as it should do but now it doesn’t.

on the lock creen there aren’t any lines to be seen, even after i leave it for a bit, but as soon as i go into my home screen these lines just start appearing.

I dropped my phone in water a few days ago which might be the cause but if so why didn’t this happen sooner? Someone please help me!