Botox injections work well on the head and face but the injection technique requires skill so patients should seek an experienced practitioner. A potential side effect of Botox injections in the face as a treatment for sweating is asymmetry, particularly of the forehead. This can happen if some of the Botox diffuses into the facial muscles. Such asymmetry, however, is temporary and can, if necessary, be balanced-out by additional Botox injections. Working with an experienced dermatologist can minimize these risks. Hope this would help. Thanks.