A puncture wound is caused by an object piercing the skin and creating a small hole. Some punctures are just on the surface. Others can be very deep, depending on the source and cause.
A puncture wound does not usually result in excessive bleeding. Usually, these wounds close fairly quickly on their own. Treatment may be necessary to prevent infection. A puncture wound from a cause such as stepping on a nail can become infected because the object that caused the wound may carry bacteria or spores of tetanus into the skin and tissue. http://www.emedicinehealth.com/puncture_wound/article_em.htm
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