12 years is a very long time.
After seeing the pictures I realize that you EXACTLY the same symptoms as me. My lips too can look just as bad if left alone.
What I don’t do is just leave them alone. People who have EC naturally lack the moist on the epidermal layer of the lip. This moist helps bind the lips together. So we must continually apply artificial moisture to help restimulate it.
Please (and this applies to everyone) always apply some sort of cream onto the lips as this will aid it ever so slightly.