The most common scenario with the eyebrow is a droop occurring in conjunction with droopy eyelids or excess skin in the lids. The eyebrow, and to a smaller extent, the eyelids, are lifted by a sheet of muscle in the forehead (frontalis) which tends to weaken with age. Other conditions such as facial palsy (weakness in the nerve) or trauma to the brow may be causing the problem.
The brow can be lifted either singly or both as required. This surgery is often performed in conjunction with other surgeries to the eyelid.
The brow droops pre-op left, and post-op right following direct brow lift.