Canker sore: A canker sore is usually a bright red lesion in the mouth with an interior that may be yellow or white. They tend to be painful. Your dentist can diagnose if you have a canker sore.
Answered 6/24/2018
4.7k views
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question