Take it out!
(if you haven't already) and clean the area very well with soap & water. If you've had a tetanus
booster within 10 years, you're ok for that, but watch for signs of infection: redness, pain, swelling, pus
, odor. If you think you're getting an infection, go to your doctor right away.
If you're a diabetic or have poor circulation, see a podiatrist immediately.