There are many causes of allergies. Some individuals are allergic to foods akin to nuts, chocolate, and shellfish, some to medicines. Some allergies convey on contact dermatitis within the type of hives or eczema. Skin allergy symptoms, or contact dermatitis is usually avoided by avoiding the allergen. Most medical professionals counsel an over-the-counter decongestant or antihistamine to deal with the symptoms related to seasonal allergies. There are different kind of therapies out there by which these allergy symptoms can be lessen.