Bullous impetigo

Bullous impetigo is a form of impetigo caused by Staphylococcus aureus which produces exfoliative toxins causing intraepidermal bullae formation. Eruptions consist of superficial bullae which are typically localized at the site of infection. They are commonly found in intertriginous areas and on extremities but may be seen anywhere. The bullae are characteristically thin-walled, flaccid, and easily rupture. While often large, their size is variable, and they may have an area of surrounding erythema at the base of the lesion. These bullae contain a clear to yellow fluid and following their rupture, a moist area is left behind and will dry with a shiny appearance. This progresses into a dry, flat crusted lesion.