[MrForbes]

If it's aluminum, then it's a real pain to remove it. If it's wood, it will get infested after a day or two, and the pus will make it easier to remove. Iron sometimes rusts and that helps start an infection, allowing the pus to help it come out.

If you're not comfortable cutting your finger open yourself to remove it, I suggest a visit to a doctor. And the cut will take time to heal, too.