I had a head cold with a fever as high as 101.0 and after about ten days the cold started to go away but then I started coughing suddenly without warning and it would last like 5 minutes then it would stop and come back later. I felt something tickling my throat like I was eating and about to swallow the food. I looked in the mirror and on the very back of my tongue almost in my throat is a white bump about the size of a pea if not a little bigger. It's been there for three days now and it doesn't hurt or anything. It's just annoying. What should I do? What is it?