I am one of those that react badly to the bites - they swell right up and God forbid I happen to scratch one - the itching will not stop. One November I had so many bites on my lower legs, I could not shave them. (and I was wearing bug spray)

I still bring bug spray with me and ALWAYS bring Bendryl spray to use after I get a bite.
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this product stops the itch instantly and I find it works better than 'Afterbite'. It comes in a stick form and a cream also.
http://www.benadryl.ca/topical/itch-stick