Drug reaction: I presume that you were given an antibiotic for your strep throat. If this is the first time you took this kind of abx, you may develop an allergy to it in about 10 days. However if the hives occur only when you are in water, it is called aquagenic urticaria for which pre-medication with an antihistamine may help. Note that if cold water is the issue , you need to see an allergist.
Answered 3/14/2017
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