Keywords: LGL, Large Granular Lymphocytic; LICU, Leflunomide-Induced Cutaneous Ulceration; PG, Pyoderma Gangrenosum; RA, Rheumatoid Arthritis; large granular lymphocytic leukemia; leflunomide; paraneoplastic; pyoderma gangrenosum; rheumatoid arthritis; ulcer.