What should I do with my dog's wound?

My dog is a Pit bull. And He keeps scratching his ears for some reason. We adopted him from a friend, and he's 2 years. So I've been taking care of him for only 3 months. I would rather not take him to the vet. because he's not a disciplined dog , but I'm training him to be one, I still have a long way to go. When he see's a dog he might attack it. I tried cleaning up his wound but he doesn't like it. Every time I place a cotton ball in his wound, he stops me from putting it, I don't Know why.
He isn't violent, he just wasn't trained by his former owner.
 
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