The leathery feel and white appearance, combined with your 6-year tobacco history, suggest a condition like OSMF (Oral Submucous Fibrosis) or Leukoplakia. This needs immediate clinical attention to prevent it from progressing.
Next Steps
Please consult an Oral Medicine Specialist or an Oral Surgeon for a physical check-up and a biopsy.
Health Tips
STOP chewing tobacco immediately, as it is the direct cause of this irritation.