It's probably a canker sore. A mild, non-contagious ulcer of the mouth. It will go away without treatment.
More prevalent in 20 something women. No cause is known but it could be stress, poor nutrition. Rinse your mouth with warm salt water to help dry it (the sore) out.
Answered by
Ajay Chawla
at
5:21 PM on February 04, 2009