In reference to food, ânitrateâ really means sodium nitrate, but should really refer to sodium nitrite. While these are two completely different chemical compounds, they are often used interchangeably by those outside of the science realm. 1  Sodium nitrate is a type of salt, naturally found in Chile and Peru.
Symptoms. Diagnosis and Treatment. Prevention. 1  Patches of chronically itchy, dry, thickened skin, usually on the hands, neck, face, and legs (but it can occur anywhere). 2  In children, the inner creases of the knees and elbows are often involved.
The symptoms of allergic eczema can vary from person to person. They may also change over time. Symptoms typically develop where contact with the allergen has occurred. In rare cases, symptoms might spread to other areas of the body. Common symptoms include: itching. a burning sensation or pain.