Waistband Mycosis Fungoides: A New Clinical Variant of Early-Stage Disease.

Case 1: A 17-year-old white man was referred for evaluation of biopsy-proven patch-stage mycosis fungoides (MF) that had first appeared 5 years previously. Asymptomatic "bruises" had appeared under his football padding in a waistband distribution, and these lesions improved during each offseason but never fully resolved. His exposure history was only positive for swimming pool water and his athletic pads. On physical examination, large, irregular, geometric tan-colored patches were present along his waistband area, in areas of contact with his football padding, with an involved body surface area (BSA) of 23.7% (Figure 1A). Examination of scale for fungal hyphae under potassium hydroxide was negative. No lymphadenopathy was present.