I'm having involuntary brow spasms 6 weeks after Botox injections for the "11" lines between my eyebrows. The dr. injected 18 units in a triangular pattern from mid brow to just above the bridge of my nose. The spasms happen on their own a couple of times a day and also if I press on my brow or lower forehead. The spasm makes my forehead pucker up in a way I never could have made before Botox. Sometimes it will just be on one half of my forehead, sometimes both. It is VERY strange looking! What is causing this?