I have a lump on my left jaw almost at the joint. I went to my dentist who sent me to an oral surgeon. The oral surgeon said it ws an ENT problem. He also said it was probably a cyst that people have benign cyst all over and not to worry about it. I was also told that it wasnt a tumor because tumors grow. How does he know its benign? Also it is growing I can now feel it on the surface where before I found it by rubbing my jaw after having a tooth filled.