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Definition Return to top
Impetigo is a common skin infection.
Causes Return to top
Impetigo is caused by streptococcus (strep) or staphylococcus (staph) bacteria. Methicillin-resistant staph aureus (MRSA) is becoming a common cause.
The skin normally has many types of bacteria on it, but intact skin is an effective barrier that keeps bacteria from entering and growing in the body. When there is a break in the skin, bacteria can enter the body and grow there, causing inflammation and infection. Breaks in the skin may occur with:
Impetigo may also occur on skin where there is no visible break.
It is most common in children, particularly those in unhealthy living conditions.
In adults, it may follow other skin disorders or a recent upper respiratory infection such as a cold or other virus. It is similar to cellulitis, but it only involves the top layers of the skin.
Impetigo is contagious. The infection is carried in the fluid that oozes from the blisters.
Symptoms Return to top
Exams and Tests Return to top
Diagnosis is based mainly on the appearance of the skin lesion.
A culture of the skin or lesion usually grows the bacteria streptococcus or staphylococcus. The culture can help determine if MRSA is the cause, because specific antibiotics are used to treat this infection.
Treatment Return to top
The goal is to cure the infection and relieve the symptoms.
A mild infection may be treated with a prescription antibacterial cream. More severe cases may require antibiotics, taken by mouth.
Wash the skin several times a day, preferably with an antibacterial soap, to remove crusts and drainage.
Outlook (Prognosis) Return to top
The sores of impetigo heal slowly and seldom scar. The cure rate is extremely high, but the condition often comes back in young children.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Call for an appointment with your health care provider if you have symptoms of impetigo.
Prevention Return to top
Prevent the spread of infection.
Good general health and hygiene help to prevent infection. Thoroughly clean minor cuts and scrapes with soap and clean water. You can also use a mild antibacterial soap.
Impetigo is contagious, so avoid touching the draining (oozing) lesions.
References Return to top
Cole C, Gazewood J. Diagnosis and treatment of impetigo. Am Fam Physician. 2007;75:859:864.Update Date: 10/3/2008 Updated by: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.