Your daughter most probably was immunised against german measles when she had her MMR at 15 months and her booster at 5 years.This may be a very mild form of german measles although the rash is usually on the face and behind the ears in german measles.An allergic response to cold water is another possibility especially if she is not ill. This is called cold urticaria.This rash responds well to an antihistamine such as Allecet syrup once daily..
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