Good question. From what I understand, people who have been healed also left their lips. Honestly, there might be one or two people out there who will claim that strictly changing their diet cured them, so I don't know how valid that approach really is. Like I said in my post, I don't think diet plays into it, and if it does, it's very minimal. You should practice a healthy lifestyle regardless, but there are many people on here I'm sure with amazing diets and they still got this. It's not internal and I haven't seen any REAL evidence to suggest otherwise.