I haven't heard of it. Maybe it's because you bite your teeth easily when you do it, so the masseter muscle will get bigger and bigger. Try to avoid this situation when you do it in the future. I really can't think of any other reason that can make your masseter muscle bigger.

However, if the masseter muscle is big, you can eat some beautiful fruits. This is specially used for face-lifting. The potassium contained in it can accelerate the metabolism of masseter muscle and make masseter muscle gradually slim down.