Snapshot A 10-day-old girl is brought to the pediatrician by her mother after noticing multiple blisters. The mother states that some of the blisters have ruptured and left behind a ring of crust. On physical examination there is two 3 cm lesions on her axillae and several smaller bullae without any erythema in the groin. A superficial wound culture grows Staphylococcus aureus. She is subsequently started on topical antibiotics. Introduction Clinical definition superficial contagious bacterial skin infection which can be divided into login to view 5 more bullets Epidemiology incidence login to view 2 more bullets demographics login to view 1 more bullet most common pathogen login to view 2 more bullets most common location login to view 1 more bullet risk factors login to view 3 more bullets Pathophysiology superficial skin blister ruptures and forms a crust Prognosis survival with treatment login to view 1 more bullet Presentation Nonbullous impetigo physcal exam login to view 1 more bullet Bullous impetigo physical exam login to view 2 more bullets Studies Labs positive Gram stain positive superficial wound culture Differential Herpes simplex virus vesicles on erythematous base (bullous impetigo typically has no erythema) Pemphigus foliaceus erythema with scaling and crusting Treatment Medical topical antibiotics login to view 2 more bullets oral antibiotics login to view 2 more bullets Complications Spread to other members of the family impetigo is highly contagious cover open skin lesions Acute post-streptococcal glomerulonephritis 1-5% of patients with nonbullous impetigo