In addition to numbness on half of my forehead, which gives me an edge in head-butting competitions, there's a fascinating and unanticipated benefit to the surgery which cut some nerves above my left eyebrow: the amount of perspiration released on that side is far less now than before. When I'm out running I no longer have a problem with salty sweat dripping into the left eye. What a deal! (The right side, alas, continues to glow as feverishly as ever.)
But if the nerves grow back and sensation returns, will the beaded brow likewise?