My cat has a bald spot mid-way his back. Totally devoid of hair. It does not seem to be sore but appears raw as he picks at it. Why do you suppose hair does not grow back in this spot. Local vet says not infection or fungal.
It could be an allergy or a behavioal problem. The hair will not grow back if your cat continues to pick. Has your vet tried depo-medrol? This may help. vetcare