Impetigo

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Infection of the surface of the skin caused by a bacterium.

The most common bacteria involved are Streptococcus pyogenes (in 70% of cases), Staphylococcus aureus (in 15% of cases), or both (in 15% of cases). The lesions usually appear on areas of the skin that have undergone minimal trauma (insect bites, superficial wounds, varicella lesions).

The lesions are small red papules that rapidly develop into thin-walled vesicles with a reddish bed that quickly rupture and form honey-coloured yellow scabs. The lesions usually spread because the kid scratches them and then touches other parts of the body where satellite lesions appear (self-inoculation). There is usually no fever or other symptoms.

The diagnosis is based on the clinical appearance of the lesions.

Treatment is based on: good general hygiene; nail clipping to prevent the lesions from spreading; and topical or oral antibiotic treatment, depending on their extent.

Bibliographic references
  1. Vogel A, Lennon D, Best E, Leversha A. Where to from here? The treatment of impetigo in children as resistance to fusidic acid emerges. N Z Med J. 2016 Oct 14;129(1443):77-83.
  2. Shetty S, Rao R, Pai S.Impetigo contagiosa in a zosteriform pattern.J Paediatr Child Health. 2016 Jun;52(6):684-5.
  3. Rush J, Dinulos JG. Skin and soft tissue infections: new discoveries and guidelines regarding the management of bacterial soft tissue infections, molluscum contagiosum, and warts. Curr Opin Pediatr. 2016 Apr;28(2):250-7.
  4. Bowen AC, Mahé A, Hay RJ, Andrews RM, Steer AC, Tong SY, Carapetis JR.The Global Epidemiology of Impetigo: A Systematic Review of the Population Prevalence of Impetigo and Pyoderma. PLoS One. 2015 Aug 28;10(8):e0136789.
  5. Romani L, Steer AC, Whitfeld MJ, Kaldor JM. Prevalence of scabies and impetigo worldwide: a systematic review. Lancet Infect Dis. 2015 Aug;15(8):960-7.
Author
Dr. Maria Trabazo
Copyright
© TeckelMedical 2026

Symptoms

    Skin blisters that produce yellow-crusted scabs


    Blisters that evolve into honey-coloured scabs


    Skin rash


    Skin with grouped vesicles that are itchy


    Redness and/or rash around the mouth

Symptoms to watch out for

Fever (temperature higher than 38 ºC)
Pass less water than a 500ml soft drink bottle in 24 hours.

Self-care

Wash the wound thoroughly with soap and water.
Avoid rubbing the area of the lesion.
Do not share towels, sheets, combs or brushes.
Avoid touching the oozing lesions.