That is what is commonly called a canker sore. You can find a descript
ion and picture here: en.wikipedia.org/wiki/Canker_sore
. The heal on their own without treatment. Although I supposed they could become infected and be an issue, but I've never heard of that happening.
I tend to get them if I've been eating way too much citrus - but there is no need to see a doctor or worry about
it. Actually, the article acts like they are very painful but I seldom have pain with mine.
Lynnwood, Lupus & Sjogren's Moderator
"Life is far too important to be taken seriously" - Oscar Wilde