Where does impetigo start?

Impetigo. Impetigo is contagious, mostly from direct contact with someone who has it but sometimes from towels, toys, clothing, or household items. After starting, impetigo often spreads to other parts of the body. This is particularly common with impetigo in children. There may be mini epidemics in day-care centers. Bacteria that cause impetigo may enter through a break in the skin.
Nose,throat ,skin. Impetigo is caused by the group a streptococcus bacteria. The same bacteria that causes strep throat. The bacteria can spread through contact of mucus from an infected person's nose/throat, or infected wounds. Some people can carry this bacteria in their throat with no symptoms.