About a month ago, I finished a meal I was eating and noticed something in the back of my mouth on my palate. It was white and appeared to look like a pimple. I was surprised as I have never seen or felt this before. It does not hurt, I have no other symptoms or ailments aside from this. The odd thing is that after a day, the "pimple" will go away and leave a small red spot, the size of the pimple, on my palate. It has not moved or grown larger. It remains the same size when it gets irritated. I don't know what irritates it. But every other day or two it will come back and stay for about a day. There is nothing else in my mouth. It is the only "bump". It feels like food is on my palate when it is swollen, that is how I first noticed it. I saw a doctor. He says that it is not an STD. He thinks it may be a stress ulcer. But I don't think I'm stressed. He prescribed me a mouthwash, but that did not get rid of it. I am concerned because I have never had this before. It must be something. Is it a pimple, ulcer, start of an STD, or an allergic reaction Allergic reactions to medication to food. Any ideas or suggestions are appreciated.