In our experience perhaps the biggest “risk” is that there may be a slight asymmetry of the effectiveness of the medication. Perhaps a client may notice a little more movement of one side of the forehead than the other a few days after treatment. In a case like that, she might come back and have a little more Botox placed in that area. Other risks include bruising, temporary redness at the injection sites, and headaches. In rare cases slight drooping of an eyelid may occur.