About mouth ulcers: They can be canker sores, cold sores, yeast overgrowth, etc... Cold sores are on lips or face, and are caused by recurrences of herpes virus, which travel to the skin surface from time to time to create sores (but initial herpes infection sores are often inside the mouth). Canker sores are inside the mouth and are not from herpes, but due to the immune system reacting to something in the mouth.
Answered 11/3/2019
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