Overview
Causes
Impetigo is caused by bacteria, most commonly Staphylococcus aureus (staph) and Group A Streptococcus (strep). These bacteria can enter the body through a cut, scrape, or insect bite, leading to infection. However, impetigo can also infect intact skin. The bacteria thrive in warm, humid conditions, making the infection more common in warmer months. Risk factors include poor hygiene, crowded living conditions, and existing skin conditions such as eczema or insect bites.
How Contagious is Impetigo?
Impetigo is highly contagious and can spread through direct skin-to-skin contact or by touching items contaminated with the bacteria, such as towels, clothing, or bedding. It can also spread through contact with sores, mucus, or nasal discharge from an infected person. Without treatment, impetigo can remain contagious for weeks. After starting antibiotic treatment, the condition is contagious until the rash disappears, scabs fall off, or after completing at least two days of antibiotics.
