A 73-year-old woman presented to the emergency department with a painful umbilical nodule that had been enlarging over the past 4 months. Physical examination revealed a painful and firm erythematous umbilical nodule measuring 2 cm in its largest diameter. What is the likely diagnosis?

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A. Keloid

B. Umbilical hernia

C. Pyoderma gangrenosum

D. Pyogenic granuloma

E. Sister Mary Joseph's nodule

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