Canker sores are internal in the mouth and herpes simplex is topical around
the lips.
My Grandmother always said canker sores were the result of an acid stomach.
I remember getting them as a child but not as an adult.  Oliva

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 canker sores are inside the
mouth
on the cheek lining or gum; they are quite sore and feel round. (Yes I do
have
gluten
intolerance). I have never found anything that helped.  They go away in
about a
week.