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Materia Medica Viva Volume 8 – page 1699

Face
Paralysis of one side of the face, usually the right; severe neuralgia from change of weather, from cold or stormy weather, from getting wet, etc.; spasms of the facial muscles in chorea; these are the great characteristics in this area.
The half-sided facial paralysis, which also affects the mouth, drawing it to one side, is mostly caused by draughts, for example from sitting in an open car, even on a warm day, and, as noted above, it can develop rather quickly, unlike other paralytic symptoms of Causticum. It may be accompanied by disorders of the sensory nerves, with a numb or ‘furry’ feeling of the face; or by neuralgic pain. The facial neuralgia may be very obstinate, with pains of a drawing, tearing and cramping nature, which are violent and come suddenly in fits, sometimes causing the patient to shout.
Pain in the cheek region, sometimes extending to the ear; in the malar bones, the zygomatic arch and the maxillae; in the chin. The pain may produce a spasm of muscles and a sensation of numbness on the side of face as if asleep. Rubbing the part with a cloth dipped in cold water will ameliorate the pain. Pains of rheumatic origin are also well-known in Causticum, and they affect especially the lower jaw and its articulation.
In chorea cases where the facial muscles are specially involved, a feature that fits in well with the tendency of neurological Causticum symptoms is to localise in single parts. Twitching of muscles of the cheek; about the mouth and nose; about the eyes; with pulsating.
The face is generally pale, sometimes yellow (more so about the temples) with bluish lips, and looks extremely sickly, often with a gloomy, dissatisfied expression. During a fit of epilepsy or other sudden attacks, however, it will become extremely red.
A key-note in the region of the lower face is: ‘Sensation of tension and pain in the jaws, so that she could open her mouth only with difficulty and had problems with eating, also because a tooth seemed too long.’
Cramp-like sensation in the lips. Swelling of the lower lip with stitching and crawling in it; burning ulcers on the inside of the lower lip.
Eruptions in the face (sometimes only on one side) are also prominent. Acne rosacea on cheeks and forehead; in dispersed groups. Acne that burns and stings. There is much itching in the face, with and without eruptions.