A Man With Asymptomatic Ulcerated White Plaques on the Soft Palate

A man in his 60s had irregular gray-white ulcers with a surrounding erythema on the soft palate, uvula, and tonsils that did not improve with oral cefuroxime. He reported sexual contact with 1 male partner over the prior 6 months; history and physical examination findings were otherwise unremarkable. What is the diagnosis and what would you do next?