See if you have an Oral and Maxillofacial Pathologist in your area. They are pretty good with that stuff to.
Start with your dentist who can refer you to an oral surgeon if your dentist feels its warranted. Ask for an oral cancer screening. If in a rush, just get an appointment with an oral sugeon or an ENT doctor for removal and biopsy of the bump. Visual inspection is always a good idea but removal and testing is the only way to know for sure.