Are they stuck or dead pixels? My understanding is that if a pixel always appears black, it's "dead" and there's no help with that. I got few pixels unstuck by

Are they stuck or dead pixels? My understanding is that if a pixel always appears black, it's "dead" and there's no help with that. I got few pixels unstuck by using similar apps and massaging the screen, but recently I got one black pixel which doesn't react to anything.