It is imperative to differentiate between an allergic reaction and a cross-reaction to 911 Derm for the purpose of this article. Allergies are a result of the body's immune response to a foreign substance. Common allergens include, but are not limited to, pollen, mold, latex, food, drugs, dust mites, pet dander, and adhesives, such as the adhesive used in 911 Derm bandages. Allergies often persist for an extended period of time or throughout one's lifetime. On the contrary, a reaction to 911 Derm may occur due to the interaction of two substances, producing unintended and undesirable effects. When the chemicals or substances are in conflict, the reaction often manifests itself as skin irritation. Reactions can manifest in a variety of ways and may last for several minutes to several days.