A 45-year-old man came to a dentist with complaints of a massive and extremely dense (resembling wood) infiltration in the parotid and retromandibular areas, which persists for 1,5months. The patient’s general condition remains largely undisturbed, signs of inflammatory process are vague and indistinct. Periodically in the infiltration area the skin assumes cyanotic-purple color, a soft patch appears in the center, where 1-2 fistulae develop and discharge pus with white granules. Periodically fistulae close and reopen.Make the diagnosis: