Overview of Bacterial Skin Infections - Skin Disorders - Merck Manuals Consumer Version (2024)

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Overview of Bacterial Skin Infections Cellulitis Erysipelas Erythrasma Folliculitis and Skin Abscesses Impetigo and Ecthyma Lymphadenitis Lymphangitis Necrotizing Skin Infections Staphylococcal Scalded Skin Syndrome

By

Wingfield E. Rehmus

, MD, MPH, University of British Columbia

Reviewed/Revised Jun 2023

VIEW PROFESSIONAL VERSION

  • Classification
  • Causes
  • Risk Factors
  • Treatment
  • Prevention

The skin provides a remarkably good barrier against bacterial infections. Although many bacteria come in contact with or reside on the skin, they are normally unable to establish an infection. When bacterial skin infections do occur, they can range in size from a tiny spot to the entire body surface. They can range in seriousness as well, from harmless to life threatening.

Bacterial skin infections develop when bacteria enter through hair follicles or through small breaks in the skin that result from scrapes, punctures, surgery, burns, sunburn, animal or insect bites, wounds, and pre-existing skin disorders. People can develop bacterial skin infections after participating in a variety of activities, for example, gardening in contaminated soil or swimming in a contaminated pond, lake, or ocean.

Classification of Bacterial Skin Infections

Some infections involve just the skin, and others also involve the soft tissues under the skin. Relatively minor infections include

  • Carbuncles Skin Abscesses

  • Ecthyma Impetigo and Ecthyma Impetigo is a superficial skin infection that leads to the formation of scabby, yellow-crusted sores and, sometimes, small blisters filled with yellow fluid. It is caused by Staphylococcus... read more

  • Erythrasma Erythrasma Erythrasma is infection of the top layers of the skin caused by the bacterium Corynebacterium minutissimum. (See also Overview of Bacterial Skin Infections.) Erythrasma affects mostly... read more

  • Folliculitis Folliculitis and Skin Abscesses Folliculitis and skin abscesses are pus-filled pockets in the skin resulting from bacterial infection. They may be superficial or deep, affecting just hair follicles or deeper structures within... read more

  • Furuncles Folliculitis and Skin Abscesses Folliculitis and skin abscesses are pus-filled pockets in the skin resulting from bacterial infection. They may be superficial or deep, affecting just hair follicles or deeper structures within... read more

  • Impetigo Impetigo and Ecthyma Impetigo is a superficial skin infection that leads to the formation of scabby, yellow-crusted sores and, sometimes, small blisters filled with yellow fluid. It is caused by Staphylococcus... read more

  • Lymphadenitis Lymphadenitis Lymphadenitis is infection of one or more lymph nodes, which usually become swollen and tender. (See also Overview of Bacterial Skin Infections.) Lymph is a fluid that oozes out of the body's... read more

  • Small skin abscesses Skin Abscesses Folliculitis and skin abscesses are pus-filled pockets in the skin resulting from bacterial infection. They may be superficial or deep, affecting just hair follicles or deeper structures within... read more (pus-filled pockets in the skin)

More serious bacterial skin and skin structure infections include

  • Cellulitis Cellulitis Cellulitis is a spreading bacterial infection of the skin and the tissues immediately beneath the skin. This infection is most often caused by streptococci or staphylococci. Redness, pain, and... read more

  • Erysipelas Erysipelas Erysipelas is a superficial form of skin infection ( cellulitis) typically caused by streptococci. (See also Overview of Bacterial Skin Infections.) Erysipelas is most commonly caused by Streptococcus... read more

  • Large skin abscesses Folliculitis and Skin Abscesses Folliculitis and skin abscesses are pus-filled pockets in the skin resulting from bacterial infection. They may be superficial or deep, affecting just hair follicles or deeper structures within... read more

  • Lymphangitis Lymphangitis Lymphangitis is infection of one or more lymphatic vessels, usually caused by streptococci. (See also Overview of Bacterial Skin Infections.) Lymph is a fluid that oozes out of the body's tiniest... read more

  • Necrotizing skin infections Necrotizing Skin Infections Necrotizing skin infections, including necrotizing cellulitis and necrotizing fasciitis, are severe forms of cellulitis. These infections cause infected skin and tissues to die (necrosis). The... read more

  • Wound infections

Staphylococcal scalded skin syndrome Staphylococcal Scalded Skin Syndrome Staphylococcal scalded skin syndrome is a complication of a staphylococcal skin infection in which the skin blisters and peels off as though burned. In addition to the blistered, peeling skin... read more , scarlet fever Streptococcal Infections Streptococcal infections are caused by any one of several species of Streptococcus. These gram-positive, sphere-shaped (coccal) bacteria (see figure ) cause many disorders, including... read more , and toxic shock syndrome Toxic Shock Syndrome Toxic shock syndrome is a group of rapidly progressive and severe symptoms that include fever, rash, dangerously low blood pressure, and failure of several organs. It is caused by toxins produced... read more are skin-related consequences of bacterial infections.

Causes of Bacterial Skin Infections

Many types of bacteria can infect the skin. The most common are Staphylococcus Staphylococcus aureus Infections Staphylococcus aureus is the most dangerous of all of the many common staphylococcal bacteria. These gram-positive, sphere-shaped (coccal) bacteria (see figure ) often cause skin infections... read more and Streptococcus Streptococcal Infections Streptococcal infections are caused by any one of several species of Streptococcus. These gram-positive, sphere-shaped (coccal) bacteria (see figure ) cause many disorders, including... read more .

Methicillin-resistant Staphylococcus aureus (also known as MRSA Methicillin-resistant Staphylococcus aureus (MRSA) Staphylococcus aureus is the most dangerous of all of the many common staphylococcal bacteria. These gram-positive, sphere-shaped (coccal) bacteria (see figure ) often cause skin infections... read more ) is a common bacteria causing skin infections in the United States. MRSA is resistant to many commonly used antibiotics because it has undergone genetic changes that allow it to survive despite exposure to some antibiotics. Because MRSA is resistant to several antibiotics Antibiotic resistance Bacteria are microscopic, single-celled organisms. They are among the earliest known life forms on earth. There are thousands of different kinds of bacteria, and they live in every conceivable... read more that used to kill it, doctors tailor their treatment based on how often MRSA is found in the local area and whether or not it has been found to be resistant to commonly used antibiotics.

Risk Factors for Bacterial Skin Infections

Some people are at particular risk of developing skin infections:

  • People with diabetes, who are likely to have poor blood flow (especially to the hands and feet), have a high level of sugar (glucose) in their blood, which decreases their ability to fight infections

  • People who are hospitalized or living in a nursing home

  • People who are older

  • People who have human immunodeficiency virus (HIV), AIDS or other immune disorders, or hepatitis

  • People who are undergoing chemotherapy or treatment with other medications that suppress the immune system

Skin that is inflamed or damaged is more likely to become infected. In fact, any break in the skin predisposes a person to infection.

Treatment of Bacterial Skin Infections

  • Antibiotics

  • Drainage of abscesses

An antibiotic ointment is used if a minor skin infection develops. Antibiotics also need to be taken by mouth or given by injection if a large area of skin is infected.

Abscesses should be cut open by a doctor and allowed to drain, and any dead tissue must be surgically removed.

Prevention of Bacterial Skin Infections

  • Cleaning skin with soap and water

Preventing bacterial skin infections involves keeping the skin undamaged and clean. When the skin is cut or scraped, the injury should be washed with soap and water and covered with a sterile bandage.

Petrolatum may be applied to open areas to keep the tissue moist and to try to keep bacteria out. Doctors recommend that people do not use antibiotic ointments (prescription or nonprescription) on uninfected minor wounds because of the risk of developing an allergy to the antibiotic.

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Overview of Bacterial Skin Infections - Skin Disorders - Merck Manuals Consumer Version (2024)

FAQs

What is an overview of bacterial skin infections? ›

Bacterial skin infections develop when bacteria enter through hair follicles or through small breaks in the skin that result from scrapes, punctures, surgery, burns, sunburn, animal or insect bites, wounds, and pre-existing skin disorders.

What is the most common bacterial disease of the skin? ›

What is the most common bacterial infection of the skin? Impetigo is a common example of a bacterial infection. Others include cellulitis and Lyme disease. The most common bacteria associated with skin infections are the Staphylococcus and Streptococcus species.

What bacteria is one of the most common causes of skin infections in the US? ›

The most common bacterial skin pathogens are Staphylococcus aureus and group A β-hemolytic streptococci. Herpes simplex is the most common viral skin disease.

What is the best antibiotic for a bacterial skin infection? ›

The following are common oral antibiotic choices for skin and soft tissue infections (SSTIs): penicillins (eg, amoxicillin, penicillin V, augmentin, dicloxacillin), cephalosporins (such as cephalexin, cefdinir), clindamycin, trimethoprim-sulfamethoxazole, doxycycline, minocycline, or linezolid.

What is the overview of bacterial infections? ›

A bacterial infection refers to the presence of harmful bacteria in the body, which can cause localized or generalized conditions such as infected wounds or gastrointestinal infections. It often leads to symptoms like fever and digestive upset, and may require treatment with antibiotics.

What kills bacterial skin infections? ›

Bacterial skin infections occur when bacteria enter through the surface of the skin. They can cause symptoms such as swelling and inflammation. Treatment may include topical or oral antibiotics.

Why do I keep getting bacterial skin infections? ›

Certain comorbid conditions increase susceptibility to bacterial skin infections, such as diabetes, vascular insufficiency, and being immunocompromised (eg, chemotherapy patients with neutropaenia). Some people, such as those who inject drugs, are at increased risk.

Can bacterial skin infections be contagious? ›

The sores are often itchy, but usually not painful. The sores develop into blisters that break open and ooze fluid -- this fluid contains infectious bacteria that can infect others if they have contact with it.

How long does a bacterial skin infection last? ›

In most cases, you should feel better within seven to 10 days after you start taking antibiotics. You'll notice signs that your cellulitis infection is healing a few days after starting antibiotics. Your pain will decrease, swelling will go down and any discoloration will begin to fade.

What does a bad bacterial infection look like? ›

Bacterial skin infections often begin as small, raised, red bumps or pustules, and may increase in size over time. They aren't always painful or warm to the touch. While some infections are easily treated with topical antibiotics, more severe infections may require oral or even IV antibiotic treatment.

What is the bad bacteria on the skin? ›

A prime example of harmful bacteria that can negatively affect the skin is Staphylococcus aureus. Put simply: It's a type of germ that can cause infections in those with chronic conditions, including diabetes, cancer, lung disease, and—you guessed it—eczema.

How do you know if a bacterial skin infection is healing? ›

Signs of healing to look for include: Reduced pain. Less firmness around the infection. Decreased swelling.

What is the best cream for a bacterial skin infection? ›

Mupirocin ointment is a medication that treats bacterial skin infections. It prevents bacteria growth and kills existing bacteria on your skin. You can rub this medication on your affected skin. Make sure you wash your hands before and after using the ointment.

What is the strongest natural antibiotic for skin infection? ›

Seven best natural antibiotics
  1. Garlic. Cultures across the world have long recognized garlic for its preventive and curative powers. ...
  2. Honey. Since ancient times, people have used honey due to its wound-healing activity and antimicrobial properties. ...
  3. Ginger. ...
  4. Echinacea. ...
  5. Goldenseal. ...
  6. Clove. ...
  7. Oregano.
Nov 14, 2023

What is the most serious skin infection? ›

1. Necrotising fasciitis. Necrotising fasciitis is a severe infection of the skin, the tissue below the skin, and the fascia (fibrous tissue that separates muscles and organs), resulting in tissue death, or necrosis. The infection is rapid, fast-spreading and fatal if not detected and treated early.

What is an example of a bacterial infection in the skin? ›

Common bacterial infections include: Campylobacter and Salmonella infections, common types of food poisoning. Cellulitis, boils and impetigo, skin infections. Pneumococcal disease, including ear and sinus infections and some types of pneumonia.

What is a potentially serious bacterial skin infection? ›

Cellulitis usually affects the lower legs, but it can occur on the face, arms and other areas. The infection happens when a break in the skin allows bacteria to enter. Left untreated, the infection can spread to the lymph nodes and bloodstream and rapidly become life-threatening.

Which condition is a bacterial infection of the skin? ›

Cellulitis, impetigo, and folliculitis are the most common bacterial skin infections seen by the family physician.

What causes bacterial infections? ›

Bacterial infections are caused by small, single-cell organisms called bacteria that invade the body. These infections are common, and there are many ways you can get them. An overgrowth of harmful bacteria causes a bacterial infection. Different types of bacteria can cause different symptoms.

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