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Hives are a common skin reaction that causes itchy bumps or raised, swollen-looking patches to appear on the skin. Relieving hives at home with tips from the American Academy of Dermatology Skip ...
Hives, also known as urticaria, is a kind of skin rash with red and/or flesh-colored, raised, itchy bumps. [1] Hives may burn or sting. [2] The patches of rash may appear on different body parts, [2] with variable duration from minutes to days, and do not leave any long-lasting skin change. [2]
Hives and other allergic reactions may develop after taking medication, for instance. Other medications cause rashes as a known side effect or as a reaction to sunlight, Johns Hopkins Medicine says.
Dogs are susceptible to allergies much like their human companions. Most allergies occur in dogs over 6 months old. A dog that is repeatedly exposed to a particular allergen becomes sensitized to it, and the immune system overreacts to a subsequent exposure, most commonly manifesting in the form of skin irritation. [1]
The condition is chronic, meaning it persists for more than six weeks, and can last for many years. [5] Symptoms include recurrent episodes of hives, which are red, itchy, and swollen areas on the skin. These episodes can be triggered by various factors, including heat, stress, or for no identifiable reason. [6]
In a normal case, the swelling will decrease without treatment within 15–30 minutes, but, in extreme cases, itchy red welts may last anywhere from a few hours to days. In some cases, welts are accompanied with a painful burning sensation. [3] This calls for more urgent treatment as the condition can impact on the patient's quality of life.
Cholinergic urticaria (CholU, CU) is a form of hives that is triggered by an elevation in body temperature, breaking a sweat, or exposure to heat.It is also sometimes called exercise-induced urticaria or heat hives.
Usually, urticarial lesions or hives are elevated, erythematous plaques with a defined perimeter. If a patient is taking antihistamines, these lesions may appear flattened and take on a range of sizes. It can affect any part of the body, including parts where clothing might press against the skin. Lesions typically do not last more than 24 hours.