The cosmetic form of botulinum toxin, often referred to by its product name Botox, is a popular non-surgical injection that temporarily reduces or eliminates frown lines, forehead creases, crow's feet near the eyes, and thick bands in the neck. Botox injections are also used in relieving facial muscle spasms and ticks.
Side effects can include: a droopy eye or lip, incomplete eye closure, and "frozen" expression.