We present a case of a 50-year-old male who complained of a sore throat persisting for 2 months. Upon physical examination, multiple mucous patches were observed in the oropharynx region, but no skin lesions were found. Fiberoptic laryngoscopy confirmed these findings. The Treponema pallidum particle agglutination test and toluidine red unheated serum test (TRUST) were positive with a titer of TRUST 1:64. The patient admitted to engaging in extramarital sexual activities with several females but no males. Based on the clinical manifestations and laboratory test results, a diagnosis of secondary syphilis of the oropharynx was established. He was treated with 2.4 million units of benzathine penicillin G by intramuscular injection once a week for 3 weeks. After 1 month, the lesions completely disappeared without any symptoms. The titer of TRUST reduced to 1:2 in 1-year follow-up. This report aims to enhance physicians' understanding and recognition of oropharyngeal syphilis, enabling timely diagnosis and effective management.
Keywords: Treponema pallidum; mucous patches; oropharyngeal syphilis; secondary syphilis.