If it's a different color then it's a stuck pixel, a dead pixel wouldn't show any color. Don't count on the manufacturer helping you because most require 8 or more dead pixels for it to be returned (dead pixels, not stuck).
There are a few programs out there to help fix it, but what I found the best way was to use a cloth and apply a moderate amount of pressure over the stuck pixel, and move it around a bit. This worked on all my stuck pixels on my monitors.