People can have different opinions from you....I think it's important to try and diagnose the issue before trying everything possible under the sun looking for a cure. Sometimes a biopsy doesn't tell you what you need or provide you a clear solution, but it does rule out certain conditions.
My opinion is that you should have certain tests run (lip swabs, allergy test, biopsy if needed, etc) by a certified dermatologist to rule out things. Sometimes those things don't give you a clear cut diagnosis and you have to start getting creative.
I'm not cured yet but am acting working with a dermatologist to come up with a solution. If people don't want to trust dermatologists, that's their choice.