I feel people are speculating, but you're correct. I had old school, cut your knee cap in half ACL surgery. Exactly half, the right half, of me knee is completely numb. Not only have I hurt my skin a few times without noticing, I've had bad knocks/bruises that probably would have kept me from walking comfortable otherwise.
This appears to target pain, leaving touch. Not quite as bad as numb. I have a small numb zone too. It's part of a toe, and I've shredded it before. Not a care in the world!
(disturbing, because I could lose the damn thing and not know, or not know how bad it is)
