BELLE'S PALSY Bell's palsy, also known as acute peripheral facial palsy of unknown cause, can occur at any age.It's believed to be the result of swelling and inflammation of the nerve that controls the muscles on one side of your face. Physiotherapy for facial paralysis works on the patient's muscles of the face, eyes, nose, lips, and other facial parts to promote facial movements effectively. And, the best part is that they can be performed within the comfort and privacy of your home.