Coat Care

Is there a horse care product that will promote my horse's coat to grow?

I introduced my horse to a new barn and he was given a bit of a brutal welcome. Its been months now and he has finally found his place. Although his cuts from the bites have healed, they have unfortunately left faint lines where his hair will not fully grow back. I thought that after he shed out of his winter coat they wouldn't be noticeable anymore but that is not the case. Is there anyway to help stimulate his hair to grow back more quickly such as a product or remedy? Thanks!

I use M-T-G by Shapely or you could use Nu-Stock as well. They both promote hair growth on scars and they've always worked for me.