Source : Webster's Revised Unabridged Dictionary (1913)

Impetigo \Im`pe*ti"go\, n. [L., fr. impetere to attack.] (Med.)
   A cutaneous, pustular eruption, not attended with fever;
   usually, a kind of eczema with pustulation.

Source : WordNet®

impetigo
     n : a very contagious infection of the skin; common in children;
         localized redness develops into small blisters that
         gradually crust and erode