Image of the Week: An unusual rash after bathing in a stream

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This patient developed these well-defined erythematous patches hours after bathing in a stream. The diagnosis is currently unknown. However, the differential diagnosis includes cercarial dermatitis, a rash caused by a reaction to microscopic parasites released by infected snails and acquired in freshwater. If you recognize this presentation, please share your experience and join the conversation on Figure 1.


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