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A 5‐year‐old girl with T‐cell acute lymphoblastic leukemia (T‐ALL) developed a progressive eruption of crusted papules and ulcerative plaques involving 80% of her body surface area with histopathology consistent with febrile ulceronecrotic Mucha–Habermann disease (FUMHD), although multiple specimens also contained clonal leukemic cells. Her skin disease was refractory to many classic treatments for...