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An 18-year-old woman was swimming in the Atlantic Ocean off the coast of Florida when suddenly she experienced a sharp, stinging pain on her arm. That evolved into a severe ache shortly, accompanied by a painful red lesion. She vomited on her way to your urgent care center, and still feels nauseous. She is also complaining of muscle cramps.
View the photo and consider what your diagnosis and next steps would be. Resolution of the case is described on the next page.

An 18-Year-Old Woman with Sudden Rash, Vomiting, and Cramping