Impetigo is a common and highly contagious superficial bacterial infection of the epidermis that is generally mild but requires prompt management to shorten its course and prevent complications such as ecthyma. It is most often caused by Staphylococcus aureus or group A beta-hemolytic Streptococcus pyogenes, either alone or in combination.
Risk factors for impetigo include skin trauma, hot and humid climates, poor hygiene, day care exposure, crowding, malnutrition, low socioeconomic status, scabies, diabetes mellitus, and other comorbidities.