What is the role of lab studies in the evaluation of id reaction (autoeczematization)?

Updated: Oct 16, 2020
  • Author: Matthew P Evans, MD; Chief Editor: Dirk M Elston, MD  more...
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Laboratory workup of id reactions is clearly indicated for dermatophytids. Strict criteria include a proven dermatophyte infection and a positive skin test finding for a group-specific trichophytin antigen. Absence of fungi in the dermatophytid lesions and clearing of the dermatophytid after the fungus is eradicated are necessary to confirm a definitive diagnosis of a dermatophytid reaction.

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