Thank you both.
I inspected him last night and he seems better - it isn't completely bald, just hair is being pulled from that area (on either side of his back).
I watched him last night when he was cleaning to check if he went for this area and he didn't. Right now I am hoping it is a one-time thing.
He was just at the vet two months ago and he had a full exam since he is a senior now - he is healthy except for being a few pounds overweight, and he had two teeth pulled.
I am trying to see if anything in his personality has changed, and it hasn't - I did start given him some Dental Diet food last month because I don't want him to have to have anymore extractions. Maybe he was stressed over the new food although he likes it. He is doing well on his diet - he was almost 23 pounds a few years ago, now he is 19 - the vet wants him at 16. He takes the Hills Feline MD diet food and I am happy it has worked - he is the type of cat that doesn't have a good metabolism.
He is an all-around mellow cat so hopefully he was just itchy there; I am hoping it isn't stress.
Thanks for sharing your story Myrabeth. My pets are my life, and they are very pampered
I have a special relationship to this cat more than any other. He is like a soulmate to me!
If things get worse I will take him in to the vet - she is a wonderful vet. Lately though, he has been stressing going there -he now wets himself in his carrying case - he has done this the past two years only; before that, it didn't bother him. Maybe because he is older.