Skin Problems & Treatments Health Center

What is impetigo?

Impetigo (say "im-puh-TY-go") is a bacterial skin infection. It causes red sores that can break open, ooze fluid, and develop a yellow-brown crust. These sores can occur anywhere on the body but most often appear around the mouth and nose.

See a picture of impetigo.

Impetigo is one of the most common skin infections in children. It can occur in adults but is seen far more often in children. Impetigo is contagious and can be spread to others through close contact or by sharing towels, sheets, clothing, toys, or other items. Scratching can also spread the sores to other parts of the body.

What causes impetigo?

Impetigo is caused by one of two kinds of bacteria-strep (streptococcus) or staph (staphylococcus). Often these bacteria enter the body when the skin has already been irritated or injured because of other skin problems such as eczema, poison ivy, insect bites, chickenpox, burns, or cuts. Children may get impetigo after they have had a cold or allergies that have made the skin under the nose raw. However, impetigo can also develop in completely healthy skin.

What are the symptoms of impetigo?

You or your child may have impetigo if you have sores:

• On the skin, especially around the nose or mouth. The sores begin as small red spots, then change to blisters that eventually break open. The sores are generally not painful, but they may be itchy.
• That ooze fluid and look crusty. Sores often look like they have been coated with honey or brown sugar.
• That increase in size and number. Sores may be as small as a pimple or larger than a coin.

How is impetigo diagnosed?

Your doctor can usually diagnose impetigo just by looking at your or your child’s skin. Sometimes your doctor will gently remove a small piece of a sore to send to a lab in order to identify the bacteria. If you or your child have other signs of illness, your doctor may order blood or urine tests.

How is impetigo treated?

Impetigo is treated with antibiotics. For cases of mild impetigo, a doctor will prescribe an antibiotic ointment or cream to put on the sores. For cases of more serious impetigo, a doctor may also prescribe antibiotic pills.

After 3 days of treatment, you or your child should begin to get better. A child can usually return to school or daycare after 24 hours of treatment.¹ If you apply the ointment or take the pills exactly as prescribed, most sores will be completely healed in 1 week.

At home, you should gently wash the sores with soap and water before you apply the medicine. If the sores are crusty, soak them in warm water for 15 minutes, scrub the crusts with a washcloth to remove them, and pat the sores dry. Do not share washcloths, towels, pillows, sheets, or clothes with others and be sure to wash these items in hot water before you use them again.