TCL Roku TV has a small marking on the top right corner of screen suddenly.

It’s been like this for two days, from a distance it doesn’t appear, but when I’m close enough, like near my desk. It’s super noticeable when I watch a tv show, or when I play my games. Veryyyy aggravating. I've only had this tv for two months now. It was meant to replace my older TV that I had for nearly two decades, and to see my screen like this kinda makes me wish I didn't get rid of my old TV.