A 29-year-old man presented with a 2-month history of rapidly growing, widespread, asymptomatic skin nodules all over his body. He denied having fever, chills, fatigue, night sweats, or weight loss. He had no history of malignant neoplasm or chemical exposure. Physical examination findings demonstrated numerous erythematous, indurated nodules involving the surface of his head, neck, torso, and extremities, without ulceration or scarring (Figure, A and B). Findings of systemic reviews were unremarkable, and there was no lymphadenopathy or peripheral nerve enlargement. Complete blood cell count with differential results were normal (white blood cell count, 6060/μL, normal range, 4500-10 000/μL; absolute neutrophils, 3070/μL, normal range, 1800-8300/μL [to convert cell counts to ×109/L, multiply by 0.001]). Serum lactate dehydrogenase level was elevated (279 U/L, normal range, 100-240 U/L [to convert to μkat/L, multiply by 0.0167]). Biopsies from skin nodules (Figure, C) and bone marrow were obtained.