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Cellulitis and necrotizing fasciitis are both serious soft tissue infections, but they differ significantly in severity and progression. Cellulitis is a common superficial skin and subcutaneous tissue infection that responds well to antibiotics, while necrotizing fasciitis is a rapidly spreading, life-threatening deep tissue infection requiring immediate surgical intervention.
Cellulitis involves bacterial invasion of the dermis and subcutaneous tissue, typically caused by Streptococcus pyogenes or Staphylococcus aureus, resulting in localized inflammation without tissue necrosis. Necrotizing fasciitis is a rapidly progressive infection that spreads along fascial planes, causing widespread tissue necrosis through bacterial toxins and thrombosis of blood vessels, often involving multiple bacterial species including Group A Streptococcus.
Early differentiation is crucial as necrotizing fasciitis requires emergency surgical debridement while cellulitis can be managed medically. Key distinguishing features include the presence of severe pain disproportionate to physical findings, rapid progression, systemic toxicity, and skin necrosis in necrotizing fasciitis, whereas cellulitis typically presents with localized erythema, warmth, and swelling without severe systemic symptoms.