I just got off the phone with the vet and she said that since it's not red and sore or looking irritated, just put some triple antibiotic creme (like neosporin) on it for a week and see if the hair starts growing back. She said as long as it's not sore and irritated and doesn't seem to be bothering him, it's not too much to worry about.

She said this is is probably what she would tell me even if I brought Tubby in, so I should do that and just keep an eye on it. If more hair starts falling out or it starts looking sore and irritated, she said then I should make an appointment and bring him in.

Thank goodness I've got some neosporin already on hand at home. The only thing she said was to be sure and rub it in good otherwise I'm sure he'd lick it all off.

Oh, and she said it's probably not from him not cleaning himself, it's just some skin condition that occurs now and then and the neosporin should take care of it.

Thanks again for all the suggestions. I'm off to administer some neosporin - and of course some treats once the neosporin is applied and all hands and arms are still intact.