What Is It?
Cellulitis is a serious bacterial infection of the skin. Bacteria break through the skin's protective outer layer, typically at the site of an injury, such as a cut, puncture, sore, burn or bite. Cellulitis can occur at the site of surgery, or where there is a catheter. Once beneath the skin surface, bacteria multiply and make chemicals that cause inflammation in the skin.
Cellulitis that is not caused by a wound or catheter most often occurs on the legs and feet. However, it can develop on any part of the body, including the trunk, arms and face. It often develops where there is edema (swelling), poor blood flow, or a skin rash that creates breaks in the skin, such as a fungus infection between the toes (athlete's foot).