The stapholococus (sp?) germ (bacteria)is what causes it. Staph lives on practically everyone's skin--somewhere on the body. When there is a break in the skin, the staph germ attacks. Most of the time, just washing the cut area right away with antibacterial, peroxide, etc., prevents an infection from occurring. When the skin's immune response isn't strong enough, the infection occurs. Antibiotics, such as augmentin, are prescribed. Usually one course is enough to clear it up. Twice i've had subcutaneous infections, where the infection was trapped below the skin. When that happened, I had to have the site lanced and drained and was put on intravenous antibiotics, rocefin or vancomyecin. These can be serious infections, especially for people with diabetes or comprimised immune systems. I have lupus, so that's why I have such a hard time with the infections. Hope this helps.
Lizbet