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Impetigo
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Skin Hair Nails

Impetigo

Impetigo is a common bacterial skin infection that primarily affects children and is characterized by itchy, crusting sores.

Overview

Impetigo is a skin infection caused by bacteria. It is usually caused by staphylococcal (staph) bacteria, but it can also be caused by streptococcal (strep) bacteria. It is most common in children between the ages of two and six. It usually starts when bacteria get into a break in the skin, such as a cut, scratch, or insect bite.

Symptoms

  • Red or pimple-like sores surrounded by red skin.
  • Sores typically appear on the face, arms, and legs.
  • Sores fill with pus, break open after a few days, and form a thick crust.
  • Itchiness (note: scratching can spread the sores).

Transmission and Treatment

Impetigo can spread by contact with sores or nasal discharge from an infected person. You can treat impetigo with antibiotics.

Frequently Asked Questions

Most cases of impetigo begin to improve within 24 to 48 hours of starting appropriate antibiotic therapy. The sores typically stop spreading, the redness subsides, and the crusts begin to dry out and fall off naturally. Full resolution of the skin lesions usually occurs within one to two weeks. If the sores do not show improvement after 48 hours, or if they worsen, it is important to contact a healthcare provider to evaluate whether the bacteria are resistant to the current medication or if a different treatment is needed.
Yes, impetigo is highly contagious and can spread through indirect contact with contaminated items. Bacteria can survive on fabrics such as towels, sheets, pillowcases, and clothing. To prevent transmission within a household, wash all linens and towels used by the infected person in hot water and dry them on a high heat setting. Additionally, the infected individual should avoid sharing personal items like combs, brushes, or clothing until the sores have fully healed and the antibiotic course is complete.
To prevent autoinoculation (spreading the infection to other areas of your own body), wash your hands thoroughly with soap and water after touching the sores or applying medication. Keep the affected area clean by gently washing it with mild soap and water, then patting it dry. Avoid picking at the crusts, as this can release bacteria and cause new sores to form nearby. If the sores are on the face, try to keep the child from scratching by keeping fingernails short and clean, and consider using loose-fitting clothing to reduce friction and irritation.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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