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Impetigo, bullous on the buttocks
Impetigo, bullous on the buttocks


Impetigo on a child's face
Impetigo on a child's face


Definition:

Impetigo is a common skin infection.



Causes, incidence, and risk factors:

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:

  • Animal bites
  • Human bites
  • Injury or trauma to the skin
  • Insect bites

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:
  • A single or possibly many blisters filled with pus; easy to pop and -- when broken -- leave a reddish raw-looking base (in infants)
  • Itching blister:
    • Filled with yellow or honey-colored fluid
    • Oozing and crusting over
  • Rash -- may begin as a single spot, but if person scratches, it may spread to other areas
  • Skin lesions on the face, lips, arms, or legs, that spread to other areas
  • Swollen lymph nodes near the infection (lymphadenopathy)


Signs and tests:

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:

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.



Support Groups:



Expectations (prognosis):

The sores of impetigo heal slowly and seldom scar. The cure rate is extremely high, but the condition often comes back in young children.



Complications:
  • Kidney failure (post-streptococcal glomerulonephritis ) (rare)
  • Many patches of impetigo (in children)
  • Permanent skin damage and scarring (very rare)
  • Spread of the infection to other parts of the body (common)


Calling your health care provider:

Call for an appointment with your health care provider if you have symptoms of impetigo.



Prevention:

Prevent the spread of infection.

  • If you have impetigo, always use a clean washcloth and towel each time.
  • Do not share towels, clothing, razors, and and other personal care products with other family members.
  • Wash your hands thoroughly after touching the skin lesions.

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:

Cole C, Gazewood J. Diagnosis and treatment of impetigo. Am Fam Physician. 2007;75:859:864.




Review Date: 10/3/2008
Reviewed 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.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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