Note to the squeamish: move along, nothing to see here.
On my last backpacking trip several weeks ago, I got a pretty bad blister coming down the mountain. It was under my left toenail! I've never seen (or even heard of) that before. It hurt pretty bad. It got infected, I went to the doc and got some antibiotics. By now, as you would expect, the infection is all cleared.
Meanwhile that toenail is, erm...detaching, checking out, separating, paring ways with the rest of my body. No pain at all, though.
I remember many years ago jtbell had this happen in a sudden incident. I have to think that's the preferable way for it to go, if it has to go...sigh.