title: Primary syphilis of the tonsil.
abstract: A 42-year-old patient with an ulcerative left tonsil that was not particularly painful was examined. The routine blood test for syphilis was reactive. The patient was found to have a chancre of the left tonsil. Painless ulcers of the left tonsil in a sexually active individual should be considered as possibly syphilitic.
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D014066:Palatine Tonsil; D013587:Syphilis / Q000175:diagnosis* / Q000635:transmission; D013588:Syphilis Serodiagnosis