I tried rubbing it off, no luck. The monitor is LG 23MP68VQ if that helps. Also I tried running Pixel Healer for 30 minutes, again, no luck.
http://i.imgur.com/8JnDA9l.jpg
http://i.imgur.com/Lg4FbAm.jpg
http://i.imgur.com/8JnDA9l.jpg
http://i.imgur.com/Lg4FbAm.jpg