Free agent don't be to disheartened because I think you are making progress. It can seem sometimes you are adrift to nowhere, but remember that every day you are gaining more knowledge.
I know you said you eat healthy, but this is what I thought until I realised I was still eating foods that were causing triggers, and the food I thought was healthy was lacking in quantity and variety.
Let's float the possibility that EC is not a trauma of the lips, it's a manifestation of a problem in the gut. Ask yourself how your general health is besides EC? Do you have skin problems elsewhere? Do you have problems with digestion sometimes? Have you ever been vaccinated ?(I have).. The body is giving clues all the time as to it's condition, we just need the knowledge to figure out what it's trying to tell us and why.