im·pe·ti·go 
(ĭm′pĭ-tīgō)
(ĭm′pĭ-tīgō)n.
A contagious skin infection, usually of children, that is caused by staphylococcal or streptococcal bacteria and is marked by superficial pustules and thick yellow crusts, commonly on the face.
[Middle English, from Latin impetīgō, from impetere, to attack; see IMPETUS.]
im′pe·tige·nous (-tĭjə-nəs) adj.