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Read MoreUnderstanding Necrotizing Fasciitis: Symptoms, Causes, and Treatment
Medically reviewed by William Wadzinski | MD, Uniformed Services University of the Health Sciences on May 4th, 2023.
Key Takeaways
- This aggressive bacterial infection destroys fascia (tissue surrounding muscles) at a rate of 2-3 centimeters per hour, with mortality rates reaching 20-40% even with treatment.
- Pain severity far exceeds what the skin appearance suggests—patients describe it as excruciating while the area may look only mildly red initially, then rapidly progresses to purple discoloration within 24-36 hours.
- Group A streptococcus causes 60% of cases, though polymicrobial infections involving multiple bacteria types are increasingly common and harder to treat.
- Emergency surgical debridement must occur within 6 hours of hospital admission for optimal outcomes—delays beyond 12 hours triple the risk of death.
- High-risk individuals include those over 65, diabetics, immunocompromised patients, and people with chronic kidney disease, who have 3-5 times higher infection rates.
Necrotizing fasciitis, also known as flesh-eating bacteria or flesh-eating disease, is a rare but serious infection that affects the skin and the tissues beneath it. This life-threatening condition can spread quickly and aggressively, causing tissue death and potentially leading to death if not treated promptly.
Symptoms of Necrotizing Fasciitis
Early symptoms of necrotizing fasciitis may resemble those of the flu or a minor skin infection. These can include:
Severe pain in the affected area
Redness and warmth around the wound
Flu-like symptoms (fever, diarrhea, nausea, dizziness, weakness)
Intense thirst due to dehydration
As the infection progresses, more advanced symptoms may develop:
Swelling and a purplish rash
Large, violet-colored marks that turn into fluid-filled blisters
Discoloration, peeling, and flakiness of the skin (gangrene)
Causes and Risk Factors
Necrotizing fasciitis is commonly caused by group A streptococcus (GAS) bacteria, the same type that causes strep throat. However, other bacteria like Vibrio vulnificus and staphylococcus can also lead to this infection. The bacteria can enter the body through surgical wounds, puncture wounds, burns, cuts, scrapes, insect bites, or abrasions.
Certain health conditions may increase the risk of developing necrotizing fasciitis, including:
Weakened immune system
Diabetes
Liver disease (cirrhosis)
Kidney disease
Cancer
Alcohol abuse
Steroid use
Injection drug use
Diagnosis and Treatment
Early diagnosis is crucial for the successful treatment of necrotizing fasciitis. If a doctor suspects this condition, the patient will likely be admitted to a hospital for testing, which may include blood tests, tissue biopsy, and CT scans.
Treatment for necrotizing fasciitis typically involves:
Intravenous (IV) antibiotic therapy
Surgery to remove damaged or dead tissue
Medications to raise blood pressure
Hyperbaric oxygen therapy
Cardiac monitoring and breathing aids
Blood transfusions
Intravenous immunoglobulin
In severe cases, amputation of the affected limb may be necessary.
Prevention and Outlook
To prevent necrotizing fasciitis and other skin infections, practice good hygiene by washing your hands regularly with soap and water or using an alcohol-based hand sanitizer. Cover open wounds with clean, dry bandages, and seek medical attention for serious or deep wounds.
The outlook for necrotizing fasciitis depends on how quickly the condition is diagnosed and treated. Early intervention is essential to prevent complications such as sepsis, shock, organ failure, limb loss, and death. With prompt and aggressive treatment, many people can recover from this life-threatening infection.
For more information on necrotizing fasciitis, visit:
The Bottom Line
This medical emergency requires recognition within hours, not days—severe pain with minimal skin changes should trigger immediate emergency care. Survival depends on rapid antibiotic administration and aggressive surgical removal of dead tissue, often requiring multiple operations. If you're experiencing disproportionate pain with spreading skin changes, Doctronic can help assess your symptoms and guide you to appropriate emergency care.
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