Hives are raised, itchy, red bumps on the surface of the skin. Hives can be acute or chronic in nature.Acute Urticaria- The word “acute” refers to a short period of time. Acute hives can last less than a day, or up to six weeks. Acute hives can be a reaction triggered by coming in contact with an allergen such as a food, animal dander, insect bite, latex or pollen. Identifying and avoiding the trigger can help prevent this allergic reaction from reoccurring.Chronic Urticaria- Unlike acute hives, chronic hives stick around for a longer period of time. Most people suffering from chronic hives have symptoms lasting longer than one year. Unfortunately, most chronic hives are idiopathic, meaning that the exact cause cannot be identified, though there is a subset of chronic hives with identifiable triggers.