From Wikipedia - "Calcipotriol (INN) or calcipotriene (USAN) is a synthetic derivative of calcitriol, a form of vitamin D"
I've used the liquid capsule vitamin D supplements (in olive oil) - you can easily pierce a capsule and smear the oil on your lips.
The Epaderm listed on this original post is also paraffin wax mix.
It'd be worth mixing vasoline and vitamin D3 oil capsules so see if you can achieve the same results.
I'm thinking 2tblsp vasoline to 10 x 5000 iu vitamin D3 capsules.
Vitamin D3 strongly reduces the inflammatory response, so there you go, a bit of correcting/putting in check the immune system at the lips.