Needle pricks from within outwards in chest; also on forehead, right side. Sticking behind ear. Difficult respiration. Skin chafed about genitals. Leucoderma and squamous syphilides. Sciatica and pain around the knee.

Dose.--Third trituration.

Relationship.--Arsenic sulph rub (influenza with intense catarrhal symptoms, great prostration and high temperature, purulent discharges, psoriasis, acne, and sciatica. Chilly even before a fire. Itching in various parts. Pellagra).