They can also get fungus in their ears. It happened to one of the horses at my barn, it's all gone and cleared up now but it left her ears very sensitive, even to the point where we have to take the bit off on her bridle and put the bridal over her ears and then put the bit on instead of pulling the bridle over her ears.
Just have a vet check it for you, always safe than sorry
Yes your horse can get ear mites and such from flies. Consult a vet if you think your horse could have something like that
My friends horse has flys keep laying egg in there ears and now she is very sensitive because you had to pop the eggs
Yes, there is. It just might be that your horse's ears are sensitive but if you suspect something you should go to the vet before it gets worse.