Well, it they're infected I'd say antibiotics are in order. There are also many over-the-counter ointments that may help ease the swelling and discomfort of the bites.
I would also have some VERY STRONG WORDS with the owner of the stallion where she was kept. This should not have happened. Yes, horses will skuffle a bit, but it sounds pretty extreme. He would be paying for any vet bills I incurred at the very least!!