I'll never again get a Samsung monitor again, this is like my third samsung monitor that has this. Not even sure if these are dead pixels or not...
It doesn´t seem like dead pixels because they´d be black. I can´t tell what it is but that happened to me when i put too much water into the cleaning process. Most likely a defect from the factory, i´d rma.
Look like dust in the inside of the screen, the korean monitor I had, had that same thing in the top corner as well, I couldn't get rid of it my self. Only way I could get rid of it is throwing the monitor in the trash after the monitor died.