I am right there with you marked for life mama's!
Mine happend in 5th grade. I stabbed myself in the hand with a freshly sharpend pencil on accident (long story). however my teacher was abolutely rude about it, too.
She was asking me questions about a book when it happend, as her nose was stuck in a book as she "listened" to me. When I brought her attention to the fact that I was bleeding and what had happend she got upset dragged me to the sink and washed it off poured hydrogen peroxide on it and handed me a band-aid, then dragged me back to her desk to finish the line of questioning. UGH!
Anyways long story short, the "lead" is still lodged in my hand as the tip broke off in my hand and the skin healed around it.
BTW I told my mom about it and she obviously didn't do anything about it. But my childhood wasn't a happy one either. In theri minds "I deserved it." for whatever reason they might have had at the time.
Yes it can be removed if you go see a doctor but it won't hurt him either.
Good luck on you decision.
Stephanie M