I get wasps down my shirt a fair amount. They sting me but it doesn't bother me that much, I just get a dime to quarter size hot spot that burns for about 30 minutes and continues to be red for another 4 hours, though not really swollen. It doesn't bother me that much. I just reach around on the shirt, find them and squish them, then when I eventually stop just pull the shirt out and shake the dead bodies out.