First of all, where does your cat sleep? If he has his own bed, you probably wash it from time to time, so you might want to consider your laundry detergent and how gentle it might be. It could be that your cat is allergic to that detergent. Does your cat always lick in the same place each time or is it more or less an all over itch type of situation? Some cats will lick excessively if they're stressed in some way. Is there loud music in your home, or a loud TV playing much of the time? Sometimes certain cats react badly to loud noises. Cats have very good hearing and vision, so if something is going on regularly in your home, you're probably used to it and barely even notice it, but your cat doesn't have the ability to just ignore stressful situations such as loud noises. Perhaps your kitty needs more play time, or more people time. Does he like to cuddle up with you but you have a limited amount of time for that sort of thing? Or perhaps he's the type of cat who doesn't like to cuddle or be fussed over too much. In that case, perhaps he's being over stimulated and needs a little break from it now and then. I guess what I'm trying to say is that you have to try different things until the licking problem solves itself.
