My lips condition also started at 17, like Healer96 too, maybe it's not just a coïncidence!
I agree that doctors/dermatologists should have more knowledge about organism and his mechanism but if they're completely lost after one or two trivial attempts it's quite chilling.
And no, they are not bad dermatologists (perhaps stupid in their approach I confess, for some), they are just surprised of a case they don't know at all and seem so resourceless facing it.