Although I am a non-smoker (never smoked), my oral cancer began with leukoplakia. I had just one small white spot on my upper gum which my dentist diligently followed for 9 years before it actually progressed to dysplasia and then diagnosed as a squamous cell carcinoma. Vikas, please start with your dentist and he/she can do an oral cancer screening with a brush biopsy which is not invasive. Even if it if that comes back negative, they can follow you closely and order a biopsy if that should ever be necessary.