Like Martisimo said, it could very well be an allergic reaction to something such as a flea bite. It could also be nervous grooming. It's called Psychogenic Alopecia, I believe. Has anything different or upsetting happened around your house lately? You are right to go to the vet though. That's always the best place to go with any problems that crop up with your kitty.
Let us know what the vet says!
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Purrs,
Munchie

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