Methicillin-resistant Staphylococcus aureus
Methicillin-resistant Staphylococcus aureus (MRSA) is a bacteria that is resistant to many antibiotics. In the community, most MRSA infections are skin infections. In medical facilities, MRSA causes life-threatening bloodstream infections, pneumonia and surgical site infections.
http://cdc.gov/mrsa/
Photos of Infection (not pretty):
http://cdc.gov/mrsa/community/photos/index.html