वेबImpetigo: Summary. Impetigo is a common, superficial, and highly contagious bacterial skin infection. There are two main types of impetigo: non-bullous and bullous. Non-bullous impetigo (70% of cases) is caused by Staphylococcus aureus, Streptococcus pyogenes, or a combination of both. Bullous impetigo is caused by S. aureus.