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Hives, or urticaria, is a form of skin rash with red, raised, itchy bumps. [1] They may also burn or sting. [2] Hives can appear anywhere on the surface of the skin. Whether the trigger is allergic or not, a complex release of inflammatory mediators, including histamine from cutaneous mast cells, results in fluid leakage from superficial blood ...
Tracking your symptoms and possible triggers could help identify what’s causing your hives. Your provider or dermatologist may also recommend allergy tests, blood work or a skin biopsy ...
Hives can present as an allergic reaction to something, like pollen or certain foods, so you may have other allergy-related symptoms along with the hives. Keratosis pilaris Bumpy "chicken skin" is ...
Symptoms of food allergy include abdominal pain, bloating, vomiting, diarrhea, itchy skin, and hives. Food allergies rarely cause respiratory (asthmatic) reactions, or rhinitis . [ 25 ]
Other symptoms to note: Hives are most of often the result of exposure to allergens, and they could be a sign of a serious allergic reaction. Hives might not cause any discoloration on darker skin ...
Symptoms are thought to be the result of histamine being released by mast cells on the surface of the skin. Despite the lack of antigens , histamine causes the skin to swell in affected areas. If the membrane that surrounds the mast cells is too weak, it will easily and rapidly break down under physical pressure, which then causes an allergic ...
Hives on the back from exposure to cold air on an individual with cold allergy. The hives were induced by riding a stationary bike shirtless for an hour next to a door cracked open on a cool day. The temperature of the air flowing in was around 10 °C (50 °F). The lighter band at chest height was covered by a heart rate monitor strap.
Physical urticaria is a distinct subgroup of urticaria (hives) that are induced by an exogenous physical stimulus rather than occurring spontaneously. [1] There are seven subcategories that are recognized as independent diseases. [2] [3] Physical urticaria is known to be painful, itchy and physically unappealing; it can recur for months to ...
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