Necrotizing soft tissue infection
Necrotizing fasciitis; Fasciitis - necrotizing; Flesh-eating bacteria; Soft tissue gangrene; Gangrene - soft tissueNecrotizing soft tissue infection is a rare but very severe type of bacterial infection. It can destroy the muscles, skin, and underlying tissue. The word "necrotizing" refers to something that causes body tissue to die.
Causes
Many different types of bacteria can cause this infection. A very severe and usually deadly form of necrotizing soft tissue infection is due to the bacteria Streptococcus pyogenes, which is sometimes called "flesh-eating bacteria" or strep.
Necrotizing soft tissue infection develops when the bacteria enters the body, usually through a minor cut or scrape. The bacteria begin to grow and release harmful substances (toxins) that kill tissue and affect blood flow to the area. With flesh-eating strep, the bacteria also make chemicals that block the body's ability to respond to the organism. As the tissue dies, the bacteria enters the blood and rapidly spreads throughout the body.
Symptoms
Symptoms may include:
- A small, red, painful lump or bump on the skin that spreads
- A very painful bruise-like area then develops and grows rapidly, sometimes in less than an hour
- The center becomes dark and dusky and then turns black and the tissue dies
- The skin may break open and ooze fluid
Other symptoms may include:
- Feeling ill
- Fever
- Sweating
- Chills
- Nausea
- Dizziness
- Weakness
- Shock
Exams and Tests
Your health care provider may be able to diagnose this condition by looking at your skin. Or, the condition may be diagnosed in an operating room by a surgeon.
Tests that may be done include:
- Ultrasound
Ultrasound
Ultrasound uses high-frequency sound waves to make images of organs and structures inside the body.
Read Article Now Book Mark Article - X-ray or CT scan
X-ray
X-rays are a type of electromagnetic radiation, just like visible light. An x-ray machine sends individual x-ray waves through the body. The images...
Read Article Now Book Mark ArticleCT scan
A computed tomography (CT) scan is an imaging method that uses x-rays to create pictures of cross-sections of the body. Related tests include:Abdomin...
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- Blood culture to check for bacteria
Blood culture
A blood culture is a laboratory test to check for bacteria or other germs in a blood sample.
Read Article Now Book Mark Article - An incision of the skin to see if pus is present
- Skin tissue biopsy and culture
Skin tissue biopsy
A skin lesion biopsy is when a small amount of skin is removed so it can be examined under a microscope. The skin is tested to look for skin conditi...
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Treatment
Treatment is needed right away to prevent death. You'll likely need to stay in the hospital. Treatment includes:
- Powerful antibiotics given through a vein (IV)
- Surgery to drain the sore and remove dead tissue
- Special medicines called donor immunoglobulins (antibodies) to help fight the infection in some cases
Other treatments may include:
- Skin grafts after the infection goes away to help your skin heal and look better
- Amputation if the disease spreads through an arm or leg
Amputation
Leg or foot amputation is the removal of a leg, foot or toes from the body. These body parts are called extremities. Amputations are done either by...
Read Article Now Book Mark Article - Hundred percent oxygen at high pressure (hyperbaric oxygen therapy) for certain types of bacterial infections
Hyperbaric oxygen therapy
Hyperbaric oxygen therapy uses a special pressure chamber to increase the amount of oxygen in the blood.
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Outlook (Prognosis)
How well you do depends on:
- Your overall health (especially if you have diabetes)
- How fast you were diagnosed and how quickly you received treatment
- The type of bacteria causing the infection
- How quickly the infection spreads
- How well treatment works
This disease commonly causes scarring and skin deformity.
Death can occur rapidly without proper treatment.
Possible Complications
Complications that may result from this condition include:
- Infection that spreads throughout your body, causing a blood infection (sepsis), which can be deadly
Blood infection
Sepsis is an illness in which the body has a severe, inflammatory response to bacteria or other germs.
Read Article Now Book Mark Article - Scarring and disfigurement
- Loss of your ability to use an arm or leg
- Death
When to Contact a Medical Professional
This disorder is severe and may be life threatening. Contact your provider right away if symptoms of infection occur around a skin injury, including:
- Drainage of pus or blood
- Fever
- Pain
- Redness
- Swelling
Prevention
Always clean the skin thoroughly after a cut, scrape, or other skin injury.
References
Abbas M, Uçkay I, Ferry T, Hakko E, Pittet D. Severe soft-tissue infections. In: Bersten AD, Handy JM, eds. Oh's Intensive Care Manual. 8th ed. Philadelphia, PA: Elsevier; 2019:chap 72.
Fitzpatrick JE, High WA, Kyle WL. Necrotic and ulcerative skin disorders. In: Fitzpatrick JE, High WA, Kyle WL, eds. Urgent Care Dermatology: Symptom-Based Diagnosis. Philadelphia, PA: Elsevier; 2018:chap 14.
Pasternack MS, Swartz MN. Cellulitis, necrotizing fasciitis, and subcutaneous tissue infections. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 93.
Review Date: 10/11/2023
Reviewed By: Elika Hoss, MD, Assistant Professor of Dermatology, Mayo Clinic, Scottsdale, AZ. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.