I just returned from the dentist, and my hopes are fulfiled!
I've had a problem for months with a minor salivary gland that keeps getting clogged. This means that whenever I salivate/eat, I get a large pimple-like thing inside my mouth (and right in the jaw-hinge, darn the luck). My dentist had suggested surgery to remove it, and I was on the cusp of agreeing.
Then, over the weekend, it got larger and more painful than ever. The next I noticed, it was a big raw sore spot. After two days of owie-owie-owie, it's been perfectly fine.
Dentist today confirmed that it appears to have spontaneously exploded and scarred over.
I'm glad it resolved itself, but I'm sorry I missed the actual explosion.