The retromolar trigone is a location in the mouth, it is not a condition. You say nothing about the possible risk factors that you might have for the disease. If you have none of them, it could be just as likely that you have an ear infection, or have congested eustacian tubes for a host of benign possible reasons, and leukoplakia. Two separate issues. Take a deep breath, wait for the biopsy and don't assume the worst.