The rashes on this woman's back and the backs of her arms is not due to a reaction from a histamine release; it is from an instantaneous exposure to a physical, non-allergic stimulus.
In her case, it's water.
Her urticaria--or skin rashes that are otherwise normally caused by airborne pathogens and bacteria--is called aquagenic urticaria, resulting when she is exposed to any variation in the exposure of her skin to water. In most cases she will have to use extreme caution when confronting an emotional situation prompting her to cry, running out to her car to retrieve something she'd forgotten while it is raining, getting really excited about kicking the soccer ball around in the backyard with her or someone else's kids and needing desperately to jump in the shower before a date.
There is no known treatment.
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