potentially become cancerous. See your doctor for:
- Unusually large canker sores
- Recurring sores, with new ones developing before old ones heal
- Persistent sores, lasting three weeks or more
- Sores that extend into the lips themselves (vermilion border)
- Pain that you can’t control with self-care measures
- Extreme difficulty eating or drinking
- High fever along with canker sores
If you have any questions, don’t 
hesitate to ‘Ask Dr. Renee’. Follow me on Twitter @AskDrRenee and on my website.
