Impetigo and Ecthyma By Wingfield E Rehmus, MD, MPH, University of British Columbia Reviewed / Revised Jun 2023 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Nonbullous Impetigo (Infant) Nonbullous Impetigo (Child) Nonbullous Impetigo Bullous Impetigo (Abdomen) Bullous Impetigo (Fingers) Ecthyma Impetigo is a superficial skin infection with crusting or bullae caused by streptococci, staphylococci, or both.