Impetigo

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Impetigo is a superficial skin infection caused by bacteria.

The bacteria most frequently involved are Streptococcus pyogenes (70% cases), Staphylococcus aureus (15% cases) or both (15% cases). They usually appear on skin areas that have suffered minimal trauma (insect bites, superficial wounds, chickenpox lesions). 

It manifests with small red bumps that rapidly evolve into thin-walled vesicles with a reddish base, rapidly rupture and form yellowish honey-colored crusts. The lesions usually spread because the child scratches and touches other areas of the body where satellite lesions also appear (autoinoculation). It is not usually accompanied by fever or other symptoms.

Diagnosis is based on the clinical appearance of the lesions.

Treatment includes: good general hygiene, nail trimming to avoid spreading the lesions and topical or oral antibiotic treatment depending on the 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 which produce yellowish scabs


    Blisters to honey-colored scabs


    Skin rash


    Grouped, itchy vesicles


    Reddening and/or rash around the mouth

Symptoms to watch out for

Fever (temperature higher than 100.4 ºF)
Urinate less than a 16 oz soft drink 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 festering lesions.