What a doll! I just love this one

Duke's never had anything like that. Have you checked with the vet? It might be some sort of allergy which Duke has had. I have to give him the Benadryl pills at night because he was itching a lot. Also, it might have to do with the area you're in. I would have the vet look at them and see if they can help. Also, it might be what is called hot spots. I don't have any knowlege of that but some other people here do.