This image displays honey-colored crusts in the beard area, typical of impetigo. This image displays a small pus-filled lesion that is developing a crust. This image displays a pus-filled lesion with crust due to a impetigo, a superficial skin infection from either strep or staph bacteria.  This image displays a lesion with a varnish-like crust typical of impetigo. This image displays intact blisters and crusted erosions showing the spectrum of skin lesions typical of impetigo. This image displays thick scaling, crusts, and erosions of the skin surface typical of impetigo.
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Impetigo  Information for adults

Picture of Impetigo: This image displays honey-colored crusts in the beard area, typical of impetigo. Divider line
This image displays honey-colored crusts in the beard area, typical of impetigo.
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Overview
Impetigo is a common and contagious bacterial skin infection that is usually a minor problem, but sometimes complications may occur that require treatment. Complications related to impetigo can include deeper skin infection (cellulitis), meningitis, or a kidney inflammation (post streptococcal glomerulonephritis, which is not prevented by treatment). Impetigo often starts with a cut or break in the skin that allows bacteria entry. Impetigo is usually caused by "staph" (Staphylococcus) or "strep" (Streptococcus) bacteria.
Who's At Risk
Impetigo is very common in children, affecting up to 10% of those who come to a pediatric clinic. Children up to 6 years old are most likely to be infected. It also may occur in adults. Those who live in a warm, humid climate are more often affected. Insect bites, crowded living conditions, and poor skin cleansing make a person prone to infection. It may spread easily through schools and day-care centers. Sports involving skin-to-skin contact, having a weak immune system, or having a chronic skin problem, such as eczema, also increase the chance of getting impetigo. Lesions on the neck and scalp may be associated with head lice.
Signs and Symptoms
There are 2 common forms: with or without fluid-filled bubbles on the skin (blisters).

Non-blistering:
  • Tiny pimples or red areas quickly turn into oozing honey-colored, crusted patches (usually less than an inch) that spread.
  • The face or traumatized areas of the skin are affected.
  • There may be some itching or swollen lymph nodes, but the person feels generally well.
  • Sometimes deeper pus-filled sores and scabs that leave scars occur.
Blistering:
  • Painless blisters (about an inch or less) occur that may break easily.
  • These often spread to the face, trunk, arms, or legs.
  • The person feels generally well.
Mild – There are only a few of either type of lesion over a small and local area of skin, and the person feels well otherwise.

Moderate – There are over 10 lesions and several small skin areas are affected.

Severe – There are many lesions, large areas of skin are affected, and/or the person feels ill with fever, diarrhea, or weakness.
Self-Care Guidelines
Prevention is very important; keep the skin clean with soap and water. Treat cuts, scrapes, and insect bites by cleaning with soap and water and covering the area if possible.

For mild infection:
  • Gently wash the area with a mild soap and water twice or more daily, and cover with gauze or a non-stick dressing if possible.
  • An over-the-counter antibiotic ointment can be applied after washing the skin 3–4 times daily. Wash hands after application or wear gloves to apply.
  • To remove crusts, soak with a vinegar solution (1 tablespoon of white vinegar to a pint of water) for 15–20 minutes.
  • Wash clothing, towels, and bedding daily and don't share these with others.
  • Wash hands frequently, try not to touch the areas, and cut the fingernails.
  • Keep a child home until there are no scabs or open areas present.
When to Seek Medical Care
Seek care for any infection that is not improving. If the infection is moderate to severe or there is fever or pain, seek medical attention.

If you are currently being treated for a skin infection that has not improved after 2–3 days of antibiotics, return to your doctor.

Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) is a strain of "staph" bacteria resistant to antibiotics in the penicillin family, which have been the cornerstone of antibiotic therapy for staph and skin infections for decades. CA-MRSA previously infected only small segments of the population, such as health care workers and persons using injection drugs. However, CA-MRSA is now a common cause of skin infections in the general population. While CA-MRSA bacteria are resistant to penicillin and penicillin-related antibiotics, most staph infections with CA-MRSA can be easily treated by health care practitioners using local skin care and commonly available non-penicillin-family antibiotics. Rarely, CA-MRSA can cause serious skin and soft tissue (deeper) infections. Staph infections typically start as small red bumps or pus-filled bumps, which can rapidly turn into deep, painful sores. If you see a red bump or pus-filled bump on the skin that is worsening or showing any signs of infection (ie, the area becomes increasingly painful, red, or swollen), see your doctor right away. Many people believe incorrectly that these bumps are the result of a spider bite when they arrive at the doctor's office. Your doctor may need to test (culture) infected skin for MRSA before starting antibiotics. If you have a skin problem that resembles a CA-MRSA infection or a culture that is positive for MRSA, your doctor may need to provide local skin care and prescribe oral antibiotics. To prevent spread of infection to others, infected wounds, hands, and other exposed body areas should be kept clean and wounds should be covered during therapy.
Treatments Your Physician May Prescribe
In addition to measures for mild impetigo already mentioned, either topical (usually mupirocin) or oral antibiotics (cephalosporins, amoxicillin, cloxacillin, dicloxacillin, erythromycin, or clindamycin) may be prescribed. If your doctor prescribes antibiotics, be sure to take the full course.



References

Bolognia, Jean L., ed. Dermatology, pp.1117-1118. New York: Mosby, 2003.

Freedberg, Irwin M., ed. Fitzpatrick's Dermatology in General Medicine. 6th ed, pp.1394, 1845, 1848, 1857-1869. New York: McGraw-Hill, 2003.
Last Updated: 22 Dec 2008