Allergy or hypersensitivity occurs when your body's immune system reacts to foreign substances that are typically not harmful to most people. These foreign substances that trigger the immune response are called allergens. Unfortunately, for some, these allergens can provoke bothersome symptoms such as runny nose and skin rash or even lead to life-threatening complications. The primary step in effectively managing your allergy is identifying and avoiding the allergens causing the problem. Allergy Tests At Home are designed to help you recognize the potential allergy triggers, including food or environmental allergens like dust and animal dander, from the comfort of your home.