I feel for you and your mare, Stillgreen! Poor girl!

I know it's likely not applicable to your situation, but your picture made me think of my thin skinned, accident prone gedling. He is not yet 4 and has a few scars already. I was recommended a new product callled Well-Horse (an antibacterial resin & enhanced healing spray). I have used it on a few nasty scrapes he has gotten. One on his face, about 3/4" wide by 1 1/2" long, right down to the fibrous white tendons. Sprayed it 1-2x per day and in 3 days it was half the size and in two weeks almost gone. Freaking amazing results. A few months ago he also got a bunch of bloody srapes on his rear cannon, this cleared it up just as fast. Stinky, messy, moderately expensive, but an absolute MUST in my emergency kit now. www.Well-Horse.com