Urticaria is a red, raised, itchy skin rash that is sometimes triggered by an allergen. An allergen is something that produces an allergic reaction. It is also known as urticaria, welts, weals, or nettle rash. When an allergic reaction occurs, the body releases a protein called histamine. When histamine is released, the tiny blood vessels known as capillaries leak fluid. The fluid accumulates in the skin and causes a rash. A combination of diet, naturopathy and ayurvedic treatments helps to treat the condition.