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The most common skin disorders that a vitamin D allergy can cause include hives and eczema, according to Drugs.com. Both allergic skin conditions are extremely itchy and cause inflammation and irritation in the skin. Hives may indicate a severe allergic reaction and needs to be evaluated by a physician.
When UVB rays hit your skin, a chemical reaction happens: Your body begins the process of converting a prohormone in the skin into vitamin D. In this process, a form of cholesterol called 7-dehydrocholesterol (7-DHC), naturally found in your skin, absorbs the UVB radiation and gets converted into cholecalciferol.