My tuxedo cat had bald spots appearing on all of his legs. I feed them high quality food and couldn't figure it out for a year after trying many remedies. Finally I read about Hemp Seeds (100% legal btw) and how they have the right amount of Omega 3's and 6's. Within one, maybe two months his fur was back! I just sprinkle it on top of his food and he eats it right up.
Over the winter his skin became a little dry so I add a little coconut oil. When I would put it on my skin he would practically appear out of no where and beg for it. I finally started listening to him and it his helping with his dandruff. I either put it in his food or put some on his paw and he licks it off.
My cat used to have several completely bald spots all over his body. It would come and go, with no pattern that was apparent to me. The only thing I noticed at first was that he would get much better in the Summer time. One Winter a few years ago I noticed that he did not get worse. In fact, he had no baldness at all. I really thought about it...I hadn't changed food...then it dawned on me: I had changed to all-natural kitty litter and stayed with it consistently for the past few months.
His bald spots had been consistent with the times I had used clumping kitty litter.
Stay away from clumping litter!