Dino,
put your mind at ease and make an appointment with an ENT or head & neck surgeon (with previous cancer experience) and have cancer ruled out definitively. You could be looking at a normal piece of your anatomy and we can't tell you over the internet. None of the doctors you have seen thus far are head & neck or cancer specialists. For what it's worth, it doesn't seem like cancer to me but if it were me and knowing what I know now about cancer, I would see a specialist.