For the last month, my daughter has been suffering from hives on average about every two days. It is driving me crazy not to mention how she is feeling. It started when we went to a friend’s place for swimming lessons, something that we had done every week for three months. She broke out in hives all over her body, arms, legs, chest, vagina, and bum, everywhere; luckily, it did not affect her breathing. I took her to the doctor straight away and he thought it must be from the chlorine in the pool, my friend then told me that it was a salt-water pool, so then we thought it must have been something that she ate.  Four days later Emma got hives again on her arms and thighs, this time after eating salted peanuts. Two days later again at 4:30 in the morning, my husband and I were beside ourselves as to what was causing this.  Each time it happened, we gave her Phenergan, which made it disappear.  We then went away for ten days, with a supply of Phenergan and Emma got them about six times while away. On coming home, I wrote down every time Emma had gotten hives, and suddenly it dawned on me that it was about half an hour after eating or swimming.  I think I have narrowed it down to additive 635, as that was the common ingredient in all of the foods Emma had been eating.  What I want to know is why this is now present when she was always having these foods, has she built up an intolerance to these foods? [See a similar report of hives from 635 and swimming in story [467]. My understanding is that saltwater pools do contain chlorine, although in smaller amounts than usual - S]