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.
The Image of the Week for June 19 is brought to you in partnership with: