I have a little red dot on my upper lip but its rather not noticable. I put toothpaste on it and it burned. The first time I noticed it was when I went to the dentist to get my teeth whitened and when they put the flouride it burned. I took a look at it in the mirror and you have to lift my lip up a little to see it. I'm scared it might be a cold sore. What could it be?
It could well be an ulcer. It is called apthous ulcer it comes during stressful situations and also when there is essential vitamin deficiency in the body.