Which findings on Wood Light exam indicate erythrasma?

Updated: Jun 11, 2020
  • Author: Abdul-Ghani Kibbi, MD, FACP; Chief Editor: William D James, MD  more...
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Wood light examination of erythrasma lesions reveals coral-red fluorescence of lesions. Results may be negative if the patient bathed prior to presentation. [31] Note the image below. The cause of this color fluorescence has been attributed to excess coproporphyrin III synthesis by these organisms, which accumulates in cutaneous tissue and emits a coral-red fluorescence when exposed to a Wood light. [32]

Under Wood lamp examination, the porphyrins produc Under Wood lamp examination, the porphyrins produced by the bacteria fluoresce with a coral pink color. A small focus is visible on this photo. If the patient recently has bathed, the pigment may be washed away. In suspicious cases, a repeat examination the following day may be necessary. Courtesy of Michael Bryan, MD.

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