My dentist, who has many years experience and has his hygenist always check for cancer missed Dx'ing a huge, highly visible tumor 6cm x 3 cm growing off of my right tonsil. If this thing is truly pain free I would be concerned. If you have an infection, it will be painful. I had a dentist tell me that it's the lack of pain to be concerned with. Two weeks won't make much difference - take the antibiotics and see if you have a response. If you do - fantastic if not - see an ENT. I went through 2 rounds of antibiotics myself to no avail.