I would exchange it and not worry about whether it is a stuck or dead pixel. In this case it looks like a stuck pixel and not a dead pixel. Consider this, if you are out of the exchange period, you might have trouble making use of the warranty since most manufacturers have a minimum requirement for dead pixels to be present (i.e.. 20) before doing any work. So I would definitely exchange even if the pixel is somehow exorcised...

Regardless, I would like to know what panel your Samsung is using; S, A or C?