7 months is nothing compared to some people who have this for years with no improvement because they dont allow the lips to heal.
I am speaking from experience, I went around a year just wiping off the white stuff (fresh skin) and applying lip balms. My lips were constantly dry, irritated, inflamed, ugly and it was a nightmare. Then for the past 6 months I left them alone, let the white stuff stay and the crusts form and slowly but surely its got less and less ugly as less crusts form and the new layers of skin have built up. I am very nearly healed now just the final layer or two of skin to build and then Im done!! Worth a few months of hard work without a doubt. Healthy lips have around 10 layers of skin on them so if we have managed to get rid of all those somehow then it is going to take time for them all to rebuild again. 7 months is about right.