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By Mayo Clinic staffYour doctor is likely to diagnose folliculitis simply by looking at your skin. When standard treatments fail to clear the infection, your doctor may send a sample taken from one of your pustules to a laboratory, where it's grown on a special medium (cultured) and then checked for the presence of bacteria. When doctors suspect eosinophilic folliculitis, they may remove a small tissue sample (biopsy) from an active lesion for testing.
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