I have a quick thing to point out. I am not trying to hate on anything or anyone I am saying this in all of our interests. With all of the talk about cures and remedies can you all please remember that nothing is a remedy or cure without leaving the lips absolutely alone. You cannot try melatonin and then apply vaseline or other oils or balm because you then do not know what is helping the lips. That only confounds the study your doing. It is imperative that you apply nothing except for the one thing you using like PS and must not apply anything else until you are done you experimenting to see if there is really any improvement.
The reason I say this is because I can simply apply melatonin or something else and a balm and my lips improve. If I apply any balm my lips improve 100% and I do not have EC at all. It goes away. BUT, I have a topical allergy so cant do that because I have done it too much in the past. My point is you must only focus on the one thing at any given time. Dont confound what your doing because then it is meaningless.