Necrosis is a medical condition in which parts of a person's body die, turn black, and fall off. This happens when the there is not enough blood reaching the tissues. This can happen for many reasons including injury, poisons, bacteria or radiation damage. The dead tissue will not grow back.
- "Necrosis: MedlinePlus Medical Encyclopedia". nlm.nih.gov. http://www.nlm.nih.gov/medlineplus/ency/article/002266.htm. Retrieved 6 December 2010.