What Is It?

Impetigo is a highly contagious bacterial skin infection, usually caused by Group A streptococcus or Staphylococcus aureus bacteria. Impetigo is most common in children. However, it sometimes occurs in adults who have other itchy skin conditions, such as eczema. Other conditions that increase your risk of developing impetigo include: chickenpox, reactions to insect bites, burns of the skin and diabetes.

Impetigo usually appears around the nose and mouth. However, it can develop wherever the skin is broken by cuts, scrapes or cold sores, and bacteria can enter.


Impetigo causes small bumps or blisters that burst. The skin underneath is moist, tender and red, and it oozes a clear liquid. A honey-colored crust, which may itch, then forms over the reddened area. If the disease is more severe cases, you also may have a fever and swelling of the lymph glands (swollen glands) in the face or neck.


A doctor can diagnose impetigo by looking at your skin. In rare cases, your doctor may swab the skin to obtain tissue and fluid that can be tested in a laboratory to identify the bacteria that caused the infection.

Expected Duration

Once treatment is started, healing should begin within three days, and the infection should be gone in about a week.


To help prevent impetigo, take a bath or shower every day, and always keep your skin clean. If you have cuts or scrapes in your skin, or a poison ivy rash, make sure to keep the area clean and covered.

If you have impetigo, you can prevent spreading the infection by not touching the affected area. You can easily spread the infection from one place on your body to another if you touch the infection then touch somewhere else. To keep impetigo from spreading, it is very important that pillowcases and sheets be washed every day. Personal items, such as soap and towels, should be kept separate from other family members. Playmates who come in contact with infected skin can develop impetigo, so children who have impetigo should try to avoid contact with others until it clears up.


Impetigo usually is treated with antibiotics, either in the form of pills or an injection. A topical skin cream such as mupirocin (Bactroban) also may be prescribed. The area around the blisters should be washed with soap and water, and the scabs should be washed away with water and an antiseptic solution such as chlorhexidine (Peridex). Then, the area should be dried. Washing away the scabs allows topical medications to reach the infection more effectively. Covering the area with gauze and tape or a loose plastic bandage can help to reduce the risk of spreading the infection to other parts of the body.

When To Call A Professional

If you think you or your child might have impetigo, contact a doctor, especially if either of you has been exposed to someone else with the condition. If impetigo is not treated, it can spread rapidly.

If you or your child is being treated for impetigo, contact the doctor if a fever develops or if an area becomes enlarged or red.


As long as the lesions are not picked, impetigo should heal without scarring. Infants are more vulnerable to complications of impetigo, such as inflammation of the kidneys (glomerulonephritis) and infection of the blood (bacteremia).

Johns Hopkins patient information

Last revised:

Diseases and Conditions Center

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All ArmMed Media material is provided for information only and is neither advice nor a substitute for proper medical care. Consult a qualified healthcare professional who understands your particular history for individual concerns.