TY - CHAP M1 - Book, Section TI - Impetigo A1 - Shah, Ashish A1 - Sobolewski, Brad A1 - Mittiga, Matthew R. A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - Impetigo is a contagious bacterial infection of the superficial skin that is caused by Streptococcus pyogenes (group A β-hemolytic Streptococcus) and S aureus. It most commonly affects children 2 to 5 years of age and usually involves the face and extremities. It begins as small vesicles or pustules with very thin roofs that rupture easily with the release of a cloudy fluid and subsequent formation of honey-colored crusts. Variants include bullous and the ulcerative forms. The lesions may spread rapidly by autoinoculation secondary to scratching and coalesce to form larger areas of infection. The differential diagnosis includes second-degree burns, varicella, herpes simplex infections, nummular dermatitis, superinfected eczema, and scabies. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/11/13 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181044341 ER -