I found out a cool little trick to help those who shave their body. I use to get razor bumps on my legs, no matter what I did, and would usually have these hives on the back of my legs or inner thighs all the time. My arms no so bad, but from time to time i would get burned.
After you shave and for a few days after that. Take a Noxzema Anti-Blemish pad, and wipe the areas you shaved. I use the blue can with the orange top. other blemish pads might work, but I havent tried them.
Now, I have virtually no razor burn what so ever after I shave.