TL;DR: grow hair in the area -> hair sends signals that regenerate myofibroblasts as fat instead of scar tissue. I guess their actual breakthrough wasn't cover

TL;DR: grow hair in the area -> hair sends signals that regenerate myofibroblasts as fat instead of scar tissue. I guess their actual breakthrough wasn't covered in the abstract. The full text is paywalled. None of the news articles actually say what the scientists did.