3 doctors weighed in:

How to know it is canker sores?

3 doctors weighed in
Dr. Heidi Fowler
Psychiatry
2 doctors agree

In brief: 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.

In brief: 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.
Dr. Heidi Fowler
Dr. Heidi Fowler
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