Impetigo is a common skin infection. It is highly contagious and usually affects infants and children. The crusty lesions are typically found around the mouth and on the face. The infecting bacteria are mostly of the streptococcal or staphylococcal species. These bacteria can enter normal skin, but more often invade skin affected by cuts, insect bites, or a pre-existing rash. The disorder may resolve on its own, but treatment with topical or oral antibiotics reduces the complication rate.