Hey, I can answer this one, being allergic to mosquito bites!
1. benadryl
2. fluocinonide cream (perscription needed)
I have tried practiclly all the home remedys, so far the above combination is working well. "After-bite" was my favorite for a long time, but then it quit working. Don't know why. Tried the meat tendorizer, soap, asprine, amonia, cutting and sucking, herbs, etc.
Just to let you know how bad they are on me, a single bite will produce a welt the size of a dime to a nickle about 3-5mm high. Sometimes they come in really funny shapes. My favorite one was a paralellagram (diamond shaped).
The biggest I have had welt was ~2.5cm dia. The doctor thought it was a spider bite or something else, but I smashed the mosquito when it bit me. So I knew what it was.
The most important thing to do is, just as the itching starts, apply the cream and take the benadryl. Don't wait for the welt to show, by then it is to late. You will be itching until the body works things out.