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I have had the same reaction to sea water since I was 14 years old.  I get a very red, very itchy rash with little white bumps under the skin.  If I wash off the sea salt with fresh water it usually takes around 30 minutes for the burning sensation to fade and then within an hour the whole thing is over.   I know people say you can't be allergic to sea water, but I can't pin point anything else it could be.  I've tried going in seas all over the world - Atlantic, Indian, Pacific, Caribbean, Arabian seas, all with the same affect. I'm certain that each and every time it can't possibly be jellyfish or 'something in the sea'.  It's defintely sea salt.   More recently I have started reacting to foods with sea salt in, as more and more food has replaced normal salt with sea salt for the so called health benefits.  As soon as I eat something with sea salt in (by accident as it's not been labelled as sea salt!), my lips sting and start to swell.  Naturally, I stop eating it straight away and rinse my lips with water. I therefore wouldn't like to predict what would happen if I carried on eating it.  Once the sea salt has been rinsed off it is normally around 40 minutes later that the stinging stops.   To those people who say 'an allergy to sea salt is very unlikely'.....I look forward to your response!