We use a product called frost shield. It is blue goop that comes in a big tub. It works great to heal the scabs and deter the flies as it has aloe and menthol in it, in addition to the lanolin. We started using it a few winters ago on our bulls. Despite being well bedded, the overnight temp it usually in the negatives (without windchill), so a bull can end up with frozen testicles very quickly. The frost shield keeps them clean and as the name implies, wards off frost bite. Putting it on the testicles of 1 1/2 dozen bull every couple of days, however, is not so fun! We've used this product a lot this summer on the lighter skinned animals and it has worked great. I would think that just about any lanolin based product would work if what you have is indeed just flies bites.