Emphysematous phlegmon is a medical condition characterized by the formation of gas-producing bacteria in the soft tissues of the body. This condition is also known as necrotizing soft tissue infection, gangrene, or gas gangrene. Some synonyms for emphysematous phlegmon include tissue gas, myonecrosis, clostridial myonecrosis, gas-producing bacterial infection, and anaerobic cellulitis. The symptoms of this condition include fever, severe pain, swelling, and reddening of the affected area, and gas formation under the skin. Treatment of emphysematous phlegmon includes antibiotics, surgery to remove dead tissue, and wound care. Early diagnosis and treatment are important to prevent the spread of infection and potential complications.