No suggestions on wound products, but here's another vote for fly boots. They will keep the bugs, as well as the sun and dirt at bay. My mare had the worst case of scratches one year, took months to clear up, and the vet thought keeping the sun off it was a big help. Totally different type of problem, I know, but you have to figure the sun on it doesn't help... plus the way fly boots lay I don't think it would touch that too much. Good luck!