I did something sort of like this---but more like the pictures in the other thread---when I first started waxing skis. I was using a clothes iron (long since replaced with something more suitable), and flat-out let it get too hot. The result was a 1" wide bubble, that sat up noticably above the rest of the base, but not too far (again, like those other pix). It was firmish, more like I had bubbled some kind of foam under the ptex than left an air gap, but that may have been an illusion.
The shop said ski on it, don't sweat it. They were right: I couldn't even tell it was there. It even went down over time, slowly (and yes, I did continue to wax those skis, just being a lot more careful about temp).
Here's the thing, and it's important: TRYING TO FIX THE PROBLEM MADE IT WORSE!!!!
(Oh, I'm sorry, was I shouting?)
One day I got impatient, and tried a trick I read online, about flattening it out by clamping a piece of flat metal over that part of the base and heating it up. The result was that I overheated the shovel of the ski, and it cupped in a way that couldn't be fixed.
Oh, and I tried the epoxy trick, too. Which meant slicing into a previously-intact base, leaving a hole in it that went down to the metal in the ski. That didn't help (it stayed bubbled), and then when they ground it down to try to fix where it was cupped, the slice separated. So now there's a hole in the base of the ski, in addition to it still being a little cupped, and ground down far enough that the next stonegrind will probably be the end of the ski. The thing that still torques me was that I did all this after it should have been clear that it was getting better on its own. Dumbass move that cost me a decent pair of (beginner) skis.
Seriously: I know what it's like to think "THIS MUST BE FIXED." If it really must, take it to the best tech you can find. But I'd leave it alone for a while and see what happens.