What are the serious complications of flesh-eating bacteria?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Flesh-eating bacteria (necrotizing fasciitis) is a rapidly progressing infection that destroys skin, fat, and muscle tissue. Without urgent treatment, it can cause tissue death, sepsis, multiple organ failure, limb amputation, and death. Early symptoms often include severe pain, swelling, redness, fever, and skin changes that worsen within hours.

Because this infection spreads so quickly, every minute matters. If you or a loved one are noticing unusual pain, swelling, or skin changes, don't wait to find out what's happening. Take a free, instant, and confidential online symptom check to better understand your symptoms and get guidance on what to do next. It only takes a few minutes—and it could help you act before a minor concern becomes a medical emergency.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Flesh-eating bacteria, also known as necrotizing fasciitis, is a serious infection that can cause severe complications. The infection can spread quickly, leading to the death of skin, muscle, and fat tissue. This condition can result in significant damage to the body and may require surgery to remove dead tissue.

Here are some serious complications:

Tissue Death: The bacteria destroy soft tissue, which can lead to large areas of dead skin that must be surgically removed.
Organ Failure: As the infection progresses, it can affect internal organs, leading to their failure.
Sepsis: This is a severe reaction to infection that can cause the body to shut down.
Amputation: In some cases, removing infected limbs may be necessary to stop the spread of infection.
Death: Without prompt treatment, necrotizing fasciitis can be fatal.

Early recognition and treatment are crucial to prevent these outcomes. If you're experiencing concerning symptoms, you can check your symptoms with our free AI-powered tool to help determine if you need immediate medical attention. Treatment often involves antibiotics and surgery to remove infected tissue. It's important to seek medical help immediately if necrotizing fasciitis is suspected.

(References)

Light TD, Choi KC, Thomsen TA, Skeete DA, Latenser BA, Born JM, et al. (2010). Long-term outcomes of patients with necrotizing fasciitis. Journal of burn care & research : official publication of the American Burn Association, 20061842.
Mudhol RR, Lingamaneni S, Sheelin S, & Vallabha A. (2024). Enterococcus necrotising fasciitis of the face after minor .... BMJ case reports, 39694659.
Nagayama J, Sato T, Takanori I, Kouji K, & Mitsunobu N. (2024). Necrotising fasciitis with extensive necrosis caused by .... BMC infectious diseases, 38649870.

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