Photos: Rare and unusual allergies
It seems that almost everyone suffers from an allergy of some kind, or knows someone who does. Allergic reactions occur when your immune system misidentifies a neutral substance, called an allergen, as harmful. Allergens come into contact with your body through inhalation, swallowing, touching or by injection. Your immune system responds by releasing chemicals that attack the allergen, which causes an allergic reaction.
And while some allergies are common (dust and pollen, for example), others are not so common—and some are downright rare. Here is a closer look at some unusual allergies:
And while some allergies are common (dust and pollen, for example), others are not so common—and some are downright rare. Here is a closer look at some unusual allergies:
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Cold
Cold-induced urticaria is a chronic, reactive skin disorder. It is probably the most common form of physical urticaria (hives). Major symptoms may include abnormal reddening of the skin (erythema), hives and itching after exposure of the skin to cold temperatures.
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