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Pruritic rash on the buttock.

Mr. Osswald is from the College of Science, University of Texas at Austin. Dr. Gilson is from UT Health San Antonio Cancer Therapy & Research Center, Texas. The authors report no conflict of interest. Correspondence: Robert T. Gilson, MD, UT Health San Antonio Cancer Therapy & Research Center, 7979 Wurzbach Rd, San Antonio, TX 78229-4427 (gilsonr@uthscsa.edu). An 18-year-old man presented with a severalweek history of an expanding pruritic serpiginous and linear eruption on the buttock. The patient recently had spent some time vacationing at the beach in the southeastern United States. Physical examination revealed erythematous linear papules and serpiginous raised tracks on the buttock. A biopsy of the lesion was performed.