I was stabbed with a pencil in the arm in 4th grade, tip broke off. Had the little gray-blue dot in my arm for years. I could feel it if I poked at it, which I

I was stabbed with a pencil in the arm in 4th grade, tip broke off. Had the little gray-blue dot in my arm for years. I could feel it if I poked at it, which I eventually stopped doing. I'd check it, or show it to someone every once in awhile. Sometime in 40s, I went to check it and it had disappeared.