*Supposedly* you can heat up a spoon (using hot water, not hot enough to burn you) and place it on the welt from the bite and it's supposed to stop the itching and shrink the welt considerably. I have personally not used this to attest to it... my sister heard about it from my mom and was very skeptical until she tried it and it worked. Nothing to lose by doing it, eh?

As far as repellants go, I'm not as versed in it. I usually get eaten up whether I use repellants or not.