Dr. Willmar Schwabe India Ferrum Arsenicosum Dilution This dilution is used when the person has low haemoglobin enlarged spleen less weight dry skin and weakness. Ferrum Arsenicosum is useful in intense heat raised temperature of body with laziness and no desire to work or move from one place to another. It also has the capability to cure eczema or when the skin is dry and moistureless.