A biopsy material was obtained from the arches of the patient’s soft palate due to a suspected tumor (Macroscopy detected an ulcer with the dense floor). In the biopsy material the following was detected: necrosis of the mucosa with infiltration of the submucosal layer by lymphocytes, epithelioid cells, plasma cells and single neutrophils. Notable is the presence of marked endovasculitis and perivasculitis. The described changes are characteristic of: