A 2-year-old boy against the background of lacunar tonsillitis developed problematic breathing through the nose and mouth. Mesopharyngoscopy shows hyperemic palatine tonsils and posterior pharyngeal wall, yellow films in the openings of the tonsillar crypts, and a protrusion on the posterior wall of the oropharynx that fluctuates during palpation. What complication must be avoided during the surgical treatment of this condition?