question: HI. I am just getting over the a very bad flu and I now have a large lump on the roof of my mouth. The lump is located towards the back of my mouth on the left hand side. It is very painful. It appeared two days ago and is about half the size of a dime. It is almost causing my entire mouth to be sore. (And I am pretty tough when it comes to pain. I have Pudendal Neuralgia!) What could it be?!?