There is always another layer underneath that is forming. It follows the logic that it is a smaller area everytime but I think it is the same for me. What is a positive is that my lips don't swell if I use nothing. The weirdest part is if anything triggers a lip swell the skin on the swollen part does not detach for very, very long and it does not thicken too much or become pasty after drying in the morning.
The only reason dedicated leave alone would not work at all is if the person was not informed of how to correct their th1 and th2 immune balance. If it is an immune system problem in the first place.