pY-STAT3 is induced in lesional MF skin. Lesional and nonlesional skin site biopsies obtained from 2 patients with MF (MF1 and MF2) were stained for pY-STAT3. Micrograph close-ups illustrate areas with pY-STAT3–positive keratinocytes (arrows) close to areas with immune infiltrates, potentially pY-STAT3–positive malignant T cells (circles). Images are scanned by the Zeiss Axio Scan.Z1 with original magnification ×20. Scale bars; 200 μm and 50 μm for close-ups.