Dr. over the years, I have observed a small annoying swelling inside my mouth and between my molars. It appears suddenly and stays for a day or two at times, and dissapears without treatment. I have observed that my appears when I eat or swallow certain cold food or when I drink very cold water. I use my tongue to probe it and its painless. when I notice it, I usually will start drinking hot fluids and within hours it dissapears on its own. What is this, and what is the cause. should I be worried?