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Water
Yep, some people are allergic to good old H2O. Known as Aquagenic urticaria, a sufferer’s symptoms can include rashes, welts, and painful boils. Side effects can last for several hours and treatment consists of the application of capsaicin creams.
The actual allergy may not be to water itself but the various additives within the water reacting with the ultra sensitive skin of said sufferers.
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