This definitely sounds familiar. My EC didn't start with accutane use, but your healing process is very similar to what I'm currently experiencing. I think mine started through stress and dry lips caused by lots of travel. I became dependent on chapstick, which I think I overused to the point that it damaged my lips. I am almost 5 months in to a no balm or topical approach. I am also on a diet that includes only whole foods (no preservatives , no processed foods, etc.), do not drink or smoke, and exercise regularly. Each peeling cycle typically brings very minor improvements and while I still have regular discomfort when talking it is much, much, much better! Natural healing takes a long time, but I think it is the only way to rid ourselves of EC. It took one person on the forum 2 years to heal, but he is now EC-free for nearly 3 years. Well worth it!
Do you still get the white gooey skin build up and do you ever have some discomfort (even if less than before)?