Cellulitis By Wingfield E Rehmus, MD, MPH, University of British Columbia Reviewed / Revised Jun 2023 View Patient Education Etiology Symptoms and Signs Diagnosis Treatment Prognosis Key Points Topic Resources Streptococcal Cellulitis... Streptococcal Cellulitis... Streptococcal Cellulitis Cellulitis Differentiating Cellulitis... Cellulitis is acute bacterial infection of the skin and subcutaneous tissue most often caused by streptococci or staphylococci.