Aquagenic urticaria, also known as water urticaria and aquagenous urticaria, is a rarely diagnosed form of physical urticaria. It is sometimes described as an allergy, although it is not a true histamine-releasing allergic reaction like other forms of urticaria. The defining symptom is a painful skin reaction resulting from contact with water. This may also be the effect of different temperatures of water, such as cold or hot and can flare with chemicals such as fluorine and chlorine.
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