The following are great home remedies and good for your notebook but may not be applicable to the original post.
1. bacon grease works great to restore hair on HEALED WOUNDS
or those in the final stage of scabbing -right before it's ready to fall off. Never on fresh wounds as you'd literally be rubbing salt in the wound. The hair will come back at least fifty percent faster. I don't know how well it works on old wounds as I've never tried it on them. Use fly spray, too.
2. Preparation H works great on fresh wounds. It is sterile, shrinks the inflammation and greatly reduces scar tissue and proud-flesh.
These are home remedies passed down to me by other horse owners and have worked well for me in the past. Obviously, try at your own risk and don't sue me if you don't get the expected results. I have no affiliation with "Bacon Grease Producers, Inc. or Preparation H"