One Brow Not Moving 1 Month After Brow Lift

Brow lift surgery can have a dramatic impact on facial aesthetics, but there is also the potential to have complications with this type of surgery. There are several different types of brow lift that can be used to address brow descent. One thing that they all have in common is the potential to damage the frontal branch of the facial nerve.
This nerve is responsible for elevating the eyebrow. During surgery, the nerve can be divided or damaged, and when this happens, eyebrow elevation is no longer possible. This may be a permanent problem. More commonly the nerve is stretched. When this occurs, the paralysis is transient and function usually returns with time.
You’re still early in the post-operative course, and there’s a good chance that this will improve with time. Be patient, your surgeon’s assessment is probably correct.

When doing a brow lift you get very close to a nerve branch of the Facial Nerve (frontal branch- the branch that raises the eyebrow)  that runs near the outside edge of the brow.  Unfortunately, there is a blood vessel that runs very close to the nerve branch.  When cauterizing the blood vessel, that nerve is at risk of both temporary or even permanent damage.  At one month you are still way to early to see nerve function return if the loss is temporary.  It usually takes 3-6 months to come back.  Permanent nerve injuries are relatively rare (I've never seen one in my practice knock-knock), so be patient and it will probably return.