Hello, a quick comment, heat destroys the venom of wasps and bees and (but I am not sure about this last one) mosquitoes..
50-60 C is enough, and one must take care not to burn himself, but it works and it is cheap,and it avoids the resulting inflamation, but it must be done straight away before the venom spreads.
Best is to heat with lighter, or to use it to heat a pocket blade or piece of steel blade (to 60C max!, not to 100C). 60 C is the temprature where something starts feelling too hot to handle.
For those that carry lemon eucalyptus oil as an alternative to DEET, direct application of it to the bite has an immediate soothing effect.