I've used bepanthen but felt it gave my lips 'too much moisture', the skin would tear on its own. Constant moisture is still my go to though (using sheer butter) as I tried leaving it alone for a month and it did nothing. I suspect I may have some kind of oral thrush because my saliva is always sticky and what I believe to be the cause of my peeling when it touches the inner lips so I'm waiting for some anti fungals. Other than that I still don't know how to reduce the swelling but I don't think that matters anyway because then the inner lip would just be more exposed to saliva more constantly. Therefore I guess you have to wait to heal it first before the swelling can go.
I'm also using Fucibet as a recent swab said I had an infection, all my previous swabs had come back negative.