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.

May 15, 2013