Which lab studies are indicated for lesions with spreading erythema in the workup of nummular dermatitis?

Updated: Aug 16, 2019
  • Author: Jami L Miller, MD; Chief Editor: William D James, MD  more...
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Answer

For lesions that have erythema spreading away from the lesions, suggesting cellulitis, swab culture of the exudate may be helpful. First-generation cephalosporins are still usually effective first-line treatment.  As methicillin-resistant Staphylococcus aureus becomes more common in a community, the culture results help choose appropriate antibiotics in treatment-resistant cases of documented secondarily infected lesions.


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