Abstract： IntroductionSyphilis is a sexually transmitted disease that is common worldwide.Because of its complicated and variant clinical manifestations,it can be challenging to diagnose.Here,we report a case of annular syphilis,which is an uncommon form of secondary syphilis,on a rare region.This interesting case provides clinicians with knowledge that may aid them in making correct and differential diagnoses.Our work also emphasizes upon the need to pay more attention to uncommon clinical presentations of syphilis.