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Fewer than 5% of cases last for more than six weeks (a condition known as chronic urticaria). [2] The condition frequently recurs. [2] [4] Hives frequently occur following an infection or as a result of an allergic reaction such as to medication, insect bites, or food. [2] Psychological stress, cold temperature, or vibration may also be a trigger.
The differential diagnosis for autoimmune urticaria includes other conditions that can cause hives or similar skin reactions. [32] These can include allergic reactions, other types of urticaria such as physical urticaria (triggered by physical stimuli such as pressure, cold, or heat), and conditions such as mastocytosis and mast cell activation ...
The hives usually disappear in a few hours after the test. In rare cases they can persist for a day or two. These hives may be itchy and are best treated by applying an over the counter hydrocortisone cream. [11] In very rare cases one may develop a full blown allergic reaction.
It’s true that breaking out in hives is an uncomfortable experience, but hives are temporary. “For most people who have hives, the episode will end, and their skin will be better within a few ...
“Antihistamine help to block the histamine pathway from forming new hives,” he says, adding that you can do this daily for as long as your symptoms last. “However, if your hives last longer ...
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 ...
Hives may appear immediately or after a delay. [17] Hives can last for a few minutes or a few days, and vary from person to person. Also, a burning sensation occurs. A serious reaction is most likely to occur for patients where the hives occur with less than three minutes of exposure (during a cold test). [18]
The first outbreak of urticaria can lead to other reactions on body parts not directly stimulated, scraped, or scratched. 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.