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An allergy is a type of immune reaction. Normally, the immune system protects the body against foreign invaders. Chemical allergies often manifest themselves as skin reactions. Most frequent environmental contaminants that cause problems include, air pollution; gas, oil, or coal fumes; formaldehyde; chlorine; phenol; carbolic acid; insecticides; disinfectants; paint; hairsprays; household cleaning products; and metals such as nickel, mercury, chrome, and beryllium.
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