Cellulitis spreads more slowly and extends more deeply into the subcutaneous tissues; hence, the borders of cellulitis are ill-defined (in contrast to erysipelas). Group A β-hemolytic Streptococcus and Staphylococcus aureus are common pathogens causing cellulitis. Streptococcus pneumoniae and Haemophilus influenzae can cause buccal cellulites associated with bacteremia in unimmunized young children. (Photo contributor: Binita R. Shah, MD.) Source: Chapter 3. Infectious Diseases, Atlas of Pediatric Emergency Medicine, 2e Citation: Shah BR, Lucchesi M, Amodio J, Silverberg M. Atlas of Pediatric Emergency Medicine, 2e; 2013 Available at: https://accessemergencymedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/shah2/shah2_c003f017.png&sec=42532840&BookID=577&ChapterSecID=42532489&imagename= Accessed: October 21, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved