Lindsey Zubritsky tells USA TODAY. "Rarely, when injected incorrectly, Botox can cause feelings of heaviness, drooping of the eyebrow or other unwanted asymmetry depending on what areas were ...

The study is the first to demonstrate that long-term use of Botox can alter the anatomy of the face, reducing the "brow droop" that is considered to be a noticeable aspect of ageing.