Macbook Pro Retina 15" 2012 developed a "ding/exploded pixel"??

I wasn't aware this could happen, but I all of the sudden have a little ding, almost like a very small bb-gun "hole" in my display...I take excellent care of this thing and there's just no way any dirt or whatever has come in contact with the display to cause such a ding. I truly believe this is an internal, hardware issue. Has anyone else had a similar issue? There are a handful of forums about other people having a similar problem. I'm of course, now at 17 months since purchase, without extended AppleCare as well. Any thoughts, suggestions, experiences are appreciated. This is my first Mac. It's a Samsung display, not LG. Already had my original LG replaced while it was in warranty due to the ghosting issues...Frustrated.