Dermatology

Impetigo

Impetigo is a contagious superficial bacterial skin infection, usually caused by Staphylococcus aureus or Streptococcus pyogenes, presenting as non-bullous crusted erosions or bullous flaccid blisters.

Definition

Impetigo is a contagious superficial bacterial infection of the skin, caused mainly by Staphylococcus aureus or Streptococcus pyogenes, with non-bullous and bullous forms.

First principles

Recognise the superficial infection

Impetigo affects the superficial skin and spreads by direct contact or contaminated towels, clothing and bedding. It often enters previously damaged skin such as eczema, bites, cuts or scratches, but can also affect healthy skin. Staphylococcus aureus and Streptococcus pyogenes are the key organisms in UK practice.

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