I dont know whether scars are incomplete healing or incorrect healing, I have been researching for years and collecting peoples experiences with scars healing and here are the top natural scar healing methods (excluding exfoliation methods) that I have observed thus far; not in any order
1. cleansing of the body (various cleanses, fasts etc)
2. high sulfur foods or supplements (MSM)
3. application of essential fatty acids to the skin or internal consumption of fatty acids
my own personal method is essential oils (in my case omega 3) plus protein in addition juicing and eating foods high in sulfur. It is working.
I would say dont get hung up on a "clean" diet. I got my scars while on such a diet.