My beard grows only in one side, why?

My guess has always been that it's caused by the side I sleep. I always sleep with the right side of my face touching the pillow, and that's the side where hair doesn't grow. However, many people do the same and don't have this problem, which makes me think maybe it's either genetic or due to a... show more My guess has always been that it's caused by the side I sleep. I always sleep with the right side of my face touching the pillow, and that's the side where hair doesn't grow. However, many people do the same and don't have this problem, which makes me think maybe it's either genetic or due to a disease.
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