Not necessarily, you don’t need a biopsy when it’s already diagnosed by a an expert medical professional.
Treatment in early stage is to avoid use of tobacco products any more . Removal of the cause will cure it .
Physiotherapist can help you with mouth opening exercises if that is getting compromised.
Only in advanced cases you may require some other treatment
Please let me know , if you are having any other symptoms.
Next Steps
Stop using tobacco products