I agree with the diet thing. I eat a pretty good diet but I ate some bad foods as well. For the past week I have been eating nothing but fruits,lean meats,veggies. NOTHING ARTIFICIAL. I also slowed down my water consumption. I think I was drinking way to much and this messed with my digestion.
The only thing I used on my lips in the past week is vegetable glycerin. I also brush and floss after every meal. Only use a mild toothpaste twice a day though.
It could also be the nice weather we have been having helping my lips as well. But they are at their best I've seen them in quite some time. Hopefully I am on the path to healing.