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Impetigo: Causes, Symptoms, and Treatment

November 27, 2024
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What is Impetigo?

Impetigo is a highly contagious bacterial skin infection, characterized by red sores and blisters. It primarily affects young children but can also occur in adults. The bacteria that cause impetigo can quickly spread through direct contact with an infected person or through contact with contaminated surfaces.

Common Symptoms of Impetigo

The most prevalent symptom of impetigo is the presence of red sores, typically around the nose and mouth. These sores can rupture, ooze, and form a yellowish crust. Other symptoms may include itching, swelling, and discomfort in the affected areas. In some cases, fever and swollen lymph nodes may also occur.

Treatment Options for Impetigo

Treatment for impetigo often depends on the severity of the infection. For mild cases, topical antibiotics may be prescribed to apply directly to the sores. In more severe cases or when the infection is widespread, oral antibiotics may be necessary. It’s crucial to complete the prescribed course of antibiotics to ensure that the infection is fully eradicated.

Preventive measures include keeping cut or scratched skin clean and covered, practicing good hygiene, and avoiding sharing personal items. Early diagnosis and treatment can prevent impetigo from spreading, making it important to seek medical attention if you suspect an infection.


Impetigo is a highly contagious bacterial skin infection that causes red sores and blisters. It is most commonly seen in children, but can also affect adults.

Types of Impetigo:

  1. Non-Bullous Impetigo: The most common type of impetigo, characterized by red sores and blisters that eventually crust over.
  2. Bullous Impetigo: A less common type of impetigo, characterized by large blisters that can take several weeks to heal.

Causes and Risk Factors:

  1. Staphylococcus aureus or Streptococcus pyogenes: Impetigo is typically caused by one of these two types of bacteria.
  2. Skin-to-Skin Contact: Impetigo is highly contagious and can be spread through skin-to-skin contact with an infected person.
  3. Poor Hygiene: Poor hygiene, such as not washing your hands regularly, can increase the risk of developing impetigo.
  4. Weakened Immune System: People with weakened immune systems, such as those with diabetes or HIV/AIDS, are more susceptible to impetigo.
  5. Warm and Humid Environments: Impetigo thrives in warm and humid environments, making it more common in tropical and subtropical regions.

Symptoms:

  1. Red Sores and Blisters: Impetigo typically starts with red sores and blisters that can appear anywhere on the body.
  2. Crusting and Oozing: The sores and blisters can crust over and ooze a yellowish fluid.
  3. Itching and Burning: Impetigo can cause itching and burning sensations on the skin.
  4. Swollen Lymph Nodes: The lymph nodes in the neck or armpits may become swollen and tender.

Diagnosis:

  1. Physical Examination: A physical examination of the skin to look for signs of impetigo.
  2. Bacterial Culture: A bacterial culture test to confirm the presence of Staphylococcus aureus or Streptococcus pyogenes.
  3. Gram Stain: A Gram stain test to identify the type of bacteria causing the infection.

Treatment:

  1. Topical Antibiotics: Topical antibiotics, such as mupirocin or fusidic acid, to treat mild cases of impetigo.
  2. Oral Antibiotics: Oral antibiotics, such as amoxicillin or clindamycin, to treat more severe cases of impetigo.
  3. Good Hygiene Practices: Good hygiene practices, such as washing the skin regularly and drying it thoroughly, to prevent the spread of impetigo.
  4. Rest and Recovery: Rest and recovery to allow the skin to heal.