that is exactly what Cooper had...do you feel like you can pick it off or pick at it..... I would try neosporin and see if it helps at all my morning...I would get it tested for mange also. Gracie has these tiny bald spots on her it almost just looked like a hole in her fur...there are like 3 and the vet tested for mange right away and I wouldn't not have even guessed mange. It wasn't Mange but he did say Mange can come quick and come is small spots like that. He also told me Coopers were allergies...environmental more than likely! Cooper did itch his either....I think they bothered me more than him. They were in his back or neck almost like by the shoulder and also toward his tail but still on his back! Is that sound like what Arnold has???