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Tests and diagnosis

By Mayo Clinic staff

Doctors usually diagnose impetigo by looking at the distinctive sores. Usually, lab tests aren't necessary. But if the sores don't clear, even with antibiotic treatment, your doctor may take a sample of the liquid produced by a sore and test it to see what types of antibiotics might work best on it. Some types of the bacteria that cause impetigo have become resistant to certain antibiotic drugs.

References
  1. Kliegman RM, et al. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.mdconsult.com/das/book/body/208746819-6/0/1608/0.html. Accessed Feb. 26, 2013.
  2. Habif TP. Clinical Dermatology: A Color Guide to Diagnosis and Therapy. 5th ed. Edinburgh, U.K.; New York, N.Y.: Mosby Elsevier; 2010. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-0-7234-3541-9..X0001-6--TOP&isbn=978-0-7234-3541-9&uniqId=230100505-57. Accessed Feb. 26, 2013.
  3. Baddour LM. Impetigo. http://www.uptodate.com/home. Accessed Feb. 26, 2013.
  4. AskMayoExpert. Impetigo. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2012.
  5. Ferri FF. Ferri's Clinical Advisor 2013:5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2012. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-0-323-08373-7..00002-9&isbn=978-0-323-08373-7&about=true&uniqId=343863096-23. Accessed Feb. 27, 2013.
  6. Impetigo care. American Academy of Pediatrics. http://www.healthychildren.org/English/health-issues/conditions/skin/Pages/Impetigo.aspx?nfstatus=401&nftoken=00000000-0000-0000-0000-000000000000&nfstatusdescription=ERROR%3a+No+local+token. Accessed Feb. 27, 2013.
  7. Gibson LE (expert opinion). Mayo Clinic, Rochester, Minn. March 12, 2013.
  8. Wolff K, et al. Fitzpatrick's Color Atlas and Synopsis of Clinical Dermatology.6th ed. New York, N.Y.: The McGraw-Hill Companies; 2009. http://www.accessmedicine.com/resourceTOC.aspx?resourceID=45. Accessed Feb. 28, 2013.
  9. Baddour LM. Patient information: Impetigo (beyond the basics). http://www.uptodate.com/home. Accessed Feb. 28, 2013.
DS00464 May 15, 2013

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