What should you know about impetigo left untreated?

Impetigo may begin as a small blister, red spot, or break in the skin and then develop a sticky crust. Without assessment and suitable treatment, it can move across nearby skin or to another person through hands, towels, bedding, and close contact. Scratching may cause additional sores and introduce bacteria deeper into damaged skin. The appearance alone cannot tell you whether a crust is impetigo, so a clinician can check for other causes such as [Atopic Dermatitis](/conditions/atopic-dermatitis/).

Gently wash affected skin, dry it by patting, keep fingernails short, and cover open sores with clean dressings. Wash hands often and avoid sharing personal items. Contact a healthcare professional for advice rather than using leftover antibiotics or squeezing blisters. Treatment may involve [Topical Antibiotic Therapy](/treatments/medical-dermatology/topical-antibiotic-therapy/) or [Antibiotics For Skin Infection](/treatments/medical-dermatology/antibiotic-therapy-for-skin-infection/), depending on the extent and site.

Seek prompt assessment when sores are multiplying, spreading, or affecting a child, older adult, or person with reduced immunity. Get urgent help for fever, rapidly worsening redness or swelling, severe tenderness, pus, red streaks, or a person who appears very unwell. Do not wait for home care if the infection is close to the eye or involves a joint.

Ask what complications to watch for, how long contact precautions should continue, whether household contacts need advice, and what to do if the rash returns after treatment.