My horse had scratches so bad that they had started to spread up both of his back legs. I tried all of the home remedies and then finally called my vet. He gave me some ointment to use and it did nothing. I had the vet out 3 different times and he gave me 3 different treatments and none of them worked.
This is what finally worked for me. I threw out all the crap the vet gave me and knew that there was no way anything could heal under those thick scabs. I got a medicated shampoo that was specifically for dogs, cats and horses with skin issues. I cannot remember the name, but I got it at Dover. I washed his legs with the shampoo and a soft sponge and ONLY picked off the scabs that got soft and loose when wet. I then dried his legs with a towel and when I was sure they were completely dry, I put a triple antibiotic on the places where the scabs had come loose. If you pick off the scabs before they loosen themselves, you are only tearing the skin and new scabs will form. I did this every day and got results very quickly.
You don't have to be crazy to work in a barn, they'll train you!