Impetigo
Impetigo is a common, contagious bacterial infection of the outer skin. It often begins as a sore or blister that breaks and leaves a golden-brown crust, commonly around the nose, mouth, hands, arms, or legs.
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In simple words
Impetigo is a superficial bacterial skin infection. It often begins as small sore-looking areas or blisters that break and leave a golden or honey-coloured crust. It is common in young children but can affect anyone, and it spreads easily through skin contact or items that have touched the affected skin. Early assessment and the right treatment reduce spread and help prevent a deeper skin infection.
A contagious bacterial infection of the outer skin, most often associated with Staphylococcus aureus, Streptococcus pyogenes, or both. Non-bullous impetigo is the more common form; a blistering form can also occur.
Common causes
- Bacteria entering through already irritated or broken skin, such as a scratch, insect bite, eczema patch, or shaving cut
- Direct contact with an affected sore or with fluid from a lesion
- Sharing towels, bedding, clothing, toys, or personal items that have contacted affected skin
Risk Factors
- Young childhood, close contact settings, and warm or humid weather
- Eczema, scabies, insect bites, cuts, or other skin damage that makes the barrier easier for bacteria to enter
- A weakened immune system, recurrent skin infection, or repeated close contact with an untreated infection
Common symptoms
- Small red, itchy, or tender sores or blisters that can break and form golden-brown crusts
- Patches that get larger or spread, often around the nose and mouth, or on exposed arms and legs
- On brown or black skin, redness may be harder to see; watch for new crusting, weeping, texture change, tenderness, or spread
Clinical Red Flags
Seek urgent medical attention at an emergency department or primary care clinic if you present with any of the following symptoms:
- Fever, rapidly spreading redness, warmth, swelling, significant pain, red streaks, or feeling unwell—these can suggest a deeper infection such as cellulitis
- A very young baby, a person with a weakened immune system, or sores on breast skin during breastfeeding
- Widespread blistering, infection around the eyes, recurrence, or worsening despite a complete clinician- or pharmacist-guided treatment plan
Lifestyle & diet support
Wash hands often, especially before and after touching or caring for affected skin. Do not pick or scratch crusts, and do not share towels, face cloths, bedding, clothes, toys, razors, or sports equipment. Wash recently used towels, sheets, and clothing as advised, keep nails short, and avoid close-contact sports or food preparation while contagious. Treat and protect eczema, scabies, cuts, and bites promptly to reduce skin-barrier breaks.
Treatment Approaches
Conventional Management
A pharmacist or clinician can assess whether the rash is impetigo and choose a treatment plan based on the number of sores, location, extent, age, and overall health. Treatment may involve a topical or oral antibiotic; use it exactly as prescribed and finish the advised course. Keep sores gently clean and covered as advised. Ask the clinician, school, nursery, or workplace about return timing, because local guidance varies and lesions generally need to be covered and improving.
Homeopathic Approach
Reliable clinical evidence has not established homeopathy as a treatment for impetigo. It should not replace appropriate antibacterial treatment or delay care for a spreading, painful, feverish, or high-risk skin infection.
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Diagnosis & tests
Investigation Protocol
A clinician can often diagnose impetigo by examining the skin. A swab may be considered when infection keeps returning, is widespread, is not responding as expected, or a different diagnosis is possible. Cold sores, eczema, scabies, insect bites, fungal infection, and deeper bacterial infection can look similar.
Differential Diagnosis
Cold sores, eczema with secondary infection, scabies, insect bites, fungal infection, chickenpox, herpes simplex, contact dermatitis, and cellulitis can resemble impetigo or coexist with it.
- A skin swab is not always needed but may be used for recurrent, widespread, severe, or treatment-resistant infection.
Imaging is not used for typical impetigo.
Differential Diagnosis Matrix
Cold sores, eczema with secondary infection, scabies, insect bites, fungal infection, chickenpox, herpes simplex, contact dermatitis, and cellulitis can resemble impetigo or coexist with it.
Reference Citations & Evidence Sources
Clinical Reviews & Textbooks
- CIT-0093Centers for Disease Control and Prevention. "About Impetigo." Centers for Disease Control and Prevention (2026).
- CIT-0094NHS. "Impetigo." NHS (2026).
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