I'd try this:
https://www.abreva.com/
While it is targeting cold sores, it works basically by rebuilding the skin of the lips, with Omega-3 fatty acids.
This is a rather unique product, and is quite pricey.
But I think it is worth a try since nothing has worked for you yet.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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