A variety of foreign bodies can become embedded in a puncture wound. Nails, glass, toothpicks, sewing needles, insulin needles, and seashells are some common ones. In addition, pieces of your own skin, sock, and shoe can be forced into the wound during a puncture, along with dirt and debris from the object. All puncture wounds are dirty wounds because they involve penetration of an object that isn't sterile. Anything that remains in the wound increases your chance of developing other problems, either in the near future or later.