I just bought a full HD Acer LED monitor (21.5'') and noticed that there was a red dot on the right hand side - sort of like a dead pixel. After a few days, this dot disappeared. A few days later, and now it's back. It only appears on a coloured background, i.e. does not show over white.
What exactly is this, I'm guessing it's not a dead pixel since it disappeared and is now back? Is there anything I can do to fix this?