Painless mouth sore - worried that it is syphilis or herpes infection, or oral cancer. how do i get tested?

Oral Surgeon: Make an appointment with a local oral surgeon who will take a full medical history and examine your lesion. A biopsy may be necessary for a proper diagnosis.

Biopsy: See your dentist to have him/her look at the lesion, then he can discuss with you what the possible diagnosis is and if you need a referral for biopsy for the true diagnosis.