Atopy or Food Related Allergic Skin Disease
Atopy and food related allergic skin disease are caused by reactions to inhaled, ingested, or absorbed "allergens" (pollen, mold spores, dust, dust mites, food, etc.). This is similar to "hay fever" in humans. However, instead of the sinus and nasal signs in humans, pets may manifest the disease as skin irritation that can include the entire skin surface and ear canals.