I don't know what else to say other than I seemed to have a slightly dodgy foot earlier. I was cleaning my apartment barefoot as per normal, and I trod on a thumb tack and it went in my heel. The thing is I didn't notice it at all until I went into the bathroom and I heard a clacking noise.
I pulled it out, and it didn't hurt, but it did go in quite a depth, and there was what I'd call a normal amount of blood on the pin and coming out my foot. I also found I was able to put a pin into the ball of my foot without feeling any pain either. But when I walk, I can feel my foot fine.
I know I have some nerve damage from a head injury years ago which did some damage (minor) to my brain stem. I also have a syrinx in my spine which will every once in a while cause temporary paralysis in either my right arm or right leg. It was the right foot in which there was a lack of pain reception.
Could it be linked in with the prior conditions, or is it something that is normal where there is tougher skin on the feet? I didn't try the left foot to see if it's the same.