True, I'd forgotten about that. Use some sort of cloth underneath so you won't make any scratches. Also, be careful in how much pressure you assert, as too much can "kill" other pixels, but then again, too little won't have any effect.
Keep up the massage for about one minute, just moving your thumb slowly around over the area of the dead pixel. If it doesn't work the first time, try with a tiny bit more pressure (but keep in mind it's electronics underneath you don't want to damage) and try again. If it still doesn't work, it truly is dead.