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A 48-year-old man with a history of ulcerative colitis that was well-controlled with adalimumab presented with a generalized acneform eruption involving the face, chest (and back, as well as a well-defined ovoid ulcer on the anterior aspect of the tongue of 2 months’ duration. Prior treatment with prednisone 60 mg daily for 14 days resulted in no improvement. He denied unintentional weight loss, cyclic fever, or arthritis. A complete blood cell count with differential showed mild anemia (hemoglobin, 11.6 g/dL [reference range, 13.2–16.6 g/dL]) with a differential cell count that was within reference range for each cell type. The erythrocyte sedimentation rate was elevated at 44 mm/h (reference range, 0–22 mm/h). A 4-mm punch biopsy specimen of an indurated cystic papule on the torso was obtained. ✏️ What's your diagnosis? A. Behçet disease B. pustular psoriasis C. SAPHO (synovitis, acne, pustulosis, hyperostosis, osteitis) syndrome D. steroid-induced acne E. syphilis