noun. a very contagious infection of the skin; common in children; localized redness develops into small blisters that gradually crust and erode.
1. Noun, singular or mass This can cause a break in the skin, leaving it vulnerable for secondary skin infections, such as impetigo. 2. Adjective In older dogs impetigo presents as acne, and is found on the lips, chin and groin of your American bulldog.