Strange smudge?

Hi guys, I recently notice this weird smudge on my oled monitor, is this a oled burn? While I play and use the monitor, there is no issues with the video. I noticed it while the monitor was off, any ideas?

Thank you in advance

Hi guys, I recently notice this weird smudge on my oled monitor, is this a oled burn? While I play and use the monitor, there is no issues with the video. I noticed it while the monitor was off, any ideas?

Thank you in advance