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A 32-year-old man from the rural area came to the doctor with complaints of a painful swelling in the submandibular region with formation of a fistula. Examination showed an infiltration; in the center of this infiltration there was a fistula with thick purulent discharge that contained white granules. The infiltration was lanced, which revealed dense yellow-green tissues with a honeycomb structure due to numerous small abscesses. What disease can be suspected?