Wow! My first post here!

My Scotty has FIV but no bald spots...first bit of advice is go to the vet.
Second, your cat may be licking himself in places where there is a problem and that develops the spot. A cat I adopted years ago developed bald spots on either side of his tummy...turned out he was in kidney failure...they lick where the "problem" is...NOT that this is what is going on with your baby....but go to the vet.