Tobacco chewing can cause cancer...
Presentation when cancer starts is highly varied, you can have small reddish patch , you can have ulcer etc. You may or may not have pain.
So, examination in person is suggested and in case of suspicion biopsy will be considered..
Next Steps
consultant a surgeon ... and take opinion..
Health Tips
stop tobacco chewing immediately..
don't panic ..it may or may not be cancer...if you get evaluated immediately we can prevent or identify at early stages.