the people who never infected will ask about is infantigo painfull to their body? the question come because this contagious skin infection like infantigo will hurt not just adult but kids also. infantigo is easy to treat. infantigo is one of the more common forms of skin infections experienced by children and is usually caused by one of two bacteria; group A streptococcus or staphylococcus aureus. The infection affects preschool and school-age children, with children being more likely to develop the infection if their skin has already been irritated by other skin issues such as poison ivy, insect bites, or eczema.