Issue with my monitor? There's a strange effect on my monitor, which looks like grease marks, but when viewed seems to be small diamonds...?

Question

I've cleaned it with a microfiber cloth but that's made no difference. It doesn't show up on photos either.

Update:

I've also Used 2 different HDMI cable on PS4 and PC and it still shows on both

Answer 1

pics plz.

it's probably pixels stuck in the on position (or maybe off). it could also be a monitor cable issue. regardless, it's something within the screen.