Ramsay Hunt syndrome (also termed Hunt's Syndrome and herpes zoster oticus) is a rare neurological disorder characterized by paralysis of the facial nerve (facial palsy) and a rash affecting the ear or mouth caused by herpes zoster virus infection of the geniculate ganglion of the facial nerve. It is caused by reactivation of herpes zoster virus that has previously caused chickenpox in the patient. Ramsay Hunt syndrome is caused by the same virus that causes chickenpox. It affects men and women equally. People with a previous chickenpox can potentially develop Ramsay Hunt syndrome. However, most cases affect older adults, especially those over 60.