Two types of bacteria cause impetigo Staphylococcus aureus (staph), which is most common, and Streptococcus pyogenes (strep).

CNN: Impetigo

Experts say Methicillin-resistant Staphylococcus aureus, or MRSA, a form of staph resistant to common antibiotics, has become a more prevalent problem in settings such as contact sports that involve skin-to-skin touching.

CNN: NFL stars no match for bacteria