A 26-year-old patient complains of inability to open his mouth, fever of 40°C, and sharp pain in the throat on the right. The pain radiates to the left ear. Objectively, noticeable trismus of the masticatory muscles and asymmetry of the right side are observed. The left palatine tonsil is hyperemic and displaced towards the middle of the oropharynx, the uvula is displaced to the left. Infiltration, bad breath, and hypersalivation are observed. Retromandibular lymph nodes on the right are enlarged and painful during palpation. Rhinoscopic and otoscopic presentations are normal. What is the most likely diagnosis in this case?