PLEASE HELP! I've had sore red dry lips for many years now, i've tried everything, biopsies, creams, diets, dermatologists, no smoking, vaseline everynight.

No matter what it always comes back, some days are better than others but it's always there. they burn and feel dry, i always feel like i have to lick them or put on vaseline. All the doctors say they look normal, it's such a lie... no one knows whats wrong, please someone help.