I was told to train my gelding to accept a rope under his tail by my new trainer. She showed me how to tighten a lariat around the horn of my saddle, put it under my horse's tail and hold the other end while she lunged him around. He did great with it, so I didn't check under his tail. I tried it at home today, and he was wonderful. But, when I was grooming him afterwards, I found a nasty rope burn under his tail! I feel terrible! I hosed it down with cold water, and put antibiotic cream on it. What else can I do to help it heal?