I had a lipoma removed and I can no longer move my eyebrow.

After having a CT and MRI done a neuro surgeon who also works in plastics assured me that my lipoma was not rooted or connected to anything and said it would be a easy removal and that the scarring would be minimal. I had this removed roughly a week ago.. I have lost the ability to raise my left eyebrow. I've questioned the surgeon about this issue and he told me that I had a nerve that was went into the lipoma that he had to cut. Is my function to move my left eyebrow gone?!