Prominent forehead creases, brow furrows or eye lines (crow’s feet) produced by specific facial expression muscles repeatedly creasing the skin may be effectively treated by reducing the function of specific facial muscles. Neurotoxins (Botox, Dysport) injected in small amounts into facial muscles bind to the nerve endings supplying the muscle and prevent nerve impulses from traveling to the muscle.
When injected into a muscle, it weakens or paralyzes the muscle around the area injected for a typical period of several months. The resultant weakening or paralyzing effect on the facial muscle temporarily reduces or eliminates previous skin creasing and new skin creasing is avoided. Botox may take several days to have its effect, and the effect typically lasts 3-4 months, in most individuals, before full muscle movement returns. At that point the treatment may be repeated as desired.