OK. I have had the same problem with my lips for about 4 years. I have seen about 50 doctors, none of which could diagnois me. I had a patch test which revealed I was very allergic to nickel. I went to a contact dermatitis specialist, and he asked me if I had any dental work. I had about 11 silver fillings and 3 crowns and 1 gold inlay. I just started removing the silver fillings, and I have the 2 crowns and 1 inlay left, but soooo much improvement. I advise you to remove the metal from your mouth, temporarily at least. This doctor is wrong for telling you its not possible. Anyone can be sensitive to anything! Although this is very rare, I have been very insecure and depressed because no one could help me. I hope this helps. E-mail me at krizos at aol dot com to discuss further.