There have been
do you mind telling me who has especially for scars?
Don't know about any that healed any scars. Scars take years to fade as the layers of skin exfoliate away. Some say massage or the duct tape method separates the scar tissue and allows new collagen to form underneath and that can smooth them out some and speed up the process.
There have been many though that claim it's the one and only diet to clear acne. I can't name them because I ignored them as that is nonsense. Diets that are Low to moderate glycemic, nutrient dense, anti-inflammatory that doesn't include anything you have an intolerance for and address any special issue you might have such as PCOS or Hypothyroidism clear acne. You can do that all kinds of ways. Everyone should eat a good amount of raw foods thought.