In second grade, 14-15 years ago, I accidentally stabbed myself in the knee with a pencil while fiddling with it under my desk. I remember feeling embarrassed because I had to go to the nurse and I had a crush on the girl sitting next to me.
There is still a little gray dot where the pencil penetrated the skin, although it’s migrated a few inches as I’ve grown. I noticed it today for the first time in years, and it got me thinking. How could the lead that is causing that stain remain in my body for so long? I assume it is either in the skin or right below the skin because of how visible it is. I know skin cells are replaced very frequently, and everything else in the body is also replaced with new cells within months or years. Shouldn’t the lead have been flushed out of my body by now?
I could imagine something big and solid remaining there (I’ve heard of bullets and shrapnel remaining inside the human body for years), but I assume the lead that’s in my body is a powder.
Can anyone provide insight on this?