Impetigo is caused by one of two types of bacteria: Staphylococcus aureus or Streptococcus pyogenes. Typically, it is spread by touching the infection and then touching another person, or by touching an item that someone else then touches. Doorknobs, light switches, and toys are all common sources of bacteria. People with impetigo can even spread it around their own body by touching an infected area and then touching another place on their body. Because impetigo does not need to enter the skin through an existing cut or break, it is easily spread from person to person.
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