Hemifacial spasm, or HFS, is a neurological disorder in which blood vessels constrict the seventh cranial nerve and cause varying degrees of facial spasming, typically originating around the eye of the afflicted side of the face. Because the nerve directs muscular activities in a particular region, interference will create involuntary contractions. Severe forms of HFS will contort an entire side of the face.
For some patients, Botox® injections (also used for cosmetic purposes) have been successful in temporarily alleviating these spasms.
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