Skin allergies occur when the immune system reacts to a specific substance that comes into contact with the skin. Common allergens that can cause skin allergies include certain metals, such as nickel or gold, perfumes, preservatives and latex. Other factors that can contribute to skin allergies include heredity, environmental factors and stress.The symptoms of skin allergy can vary depending on the specific allergen and the severity of the reaction. Common symptoms include itching, redness, redness, swelling and a rash that can range from small bumps to large blisters. In some cases, the skin may become dry, scaly or peeling and the blisters may serrate or crust over.