HELP Cat itching scabs problem

My cat has been suffering with this affliction for months now. At first it started with one or two wound looking spots on his head, in front of his ears. I thought maybe someone had shot him with a bb gun or something. As time went on the wounds and scabs would seem to heal but then would come back worse. This is the worse I’ve ever seen it. He itches the scabs even though it’s obvious but the way he meows that he’s in pain when he does. My parents and I have taken him to the vet 3 or 4 times now for this and nothing has seemed to work. If anyone has any ideas as to whats going on or what we should do, I’m begging.