Chelsea, Nads can get dirt and oil trapped in it with each use, which can lead to pimples.
Working clean is the key to avoiding excessive irritation. Wash hands throroughly before plucking, and cleanse both the tweezers and the area to be treated.
I'd try cleansing the area before and after with witch hazel to help keep bacteria down. This will also help with redness.
I like to use Tend skin after waxing or plucking-- it burns a little when you first put it on, but I find that it really reduces the redness.
I also like using 100% aloe gel (not cream), which is a very cooling and soothing thing to put on.
Maybe one or more of these can help you, too!