I am apparently allergic to these things. My bites swell to huge sizes and I get red marks running up my arms and it itches like crazy, almost like a burning itch. However, doing some research I found an effective way to stop the itch. Its not for everyone, but for someone like me who can’t even touch the shells (my fingers have gotten swollen searching for the damn things), this works for me. Again, not for everyone:
CrossFire Bed Bug Concentrate has two different active ingredients for dual modes of action (both a quick kill and residual activity). Mix 3 oz of CrossFire Insecticide with one gallon of water or 0.75 oz per quart (Remember to use what you mix-within 24 hours.) Adjust the spray pattern to a mist by turning the nozzle. A low fine mist is best for most spraying, but you may need to use a stream to get into some cracks and crevices. If you can't get into the cracks and crevices use one of the aerosols described below with it's crack and crevice tips to reach into these areas.
The size of bed bug bites varies with a number of different factors. Bed bugs inject an anti-coagulant along with their saliva when they pierce the skin to take a blood meal. This anti-coagulant is mostly responsible for how a person reacts to the bite and determines the size of the bug’s bite. Since people will have various sensitivities to the bed bug’s bite, the size of the bite will vary, as well. Another factor that influences the size of a bed bug reaction is the number of times a person is bitten. Bite reactions of people bitten many times are also variable, and their response may be either more or less intense as the number of bites increases.