I wish I could help you. I've had simialr symptoms for hte past two years or so and I can't seem to find an answer. It's also puzzling because it comes and goes. Sometimes it feels like I burned it with a curling iron, but that's not happened. I've had others look at it, but they can't see anything unusual. But when I touch it, it sure does hurt! Today, I can't feel it, but I'd bet my last dime that sometime in the next few days it will come back again. Hmmmm. What a conundrum.
If you hear of anything, please let me know.