Impetigo predominantly occurs among children and is highly contagious. Spread is mainly from skin to skin, although in streptococcal case infected individuals may acquire the disease from pharyngeal colonisation. Trauma, for example from scratching insect bites, and infestation commonly predispose to the infection. Exposed parts are mainly affected. The early lesions are clear or turbid blisters which soon become crusts, often become yellow, with a surroudning zone of erythema.
Regional lymphadenopathy is common.
Treatment Gentle removal of crust is helpful. If localised, a topical antibiotic is adequate. For widespread impetigo, oral antibiotics should be used. Improvements of hygiene may be advisable, eg not sharing towels.