The next time you get an insect bite, try making a paste out of meat tenderizer and water and then placing it on the bite. My dad swears by this. Lately he's been getting quite a few bites (he's been working outside) and he has found that if he puts the paste on not only does the bite stop itching but it heals faster. I believe it will work with any meat tenderizer but, the name of the tenderizer he uses is Adolph's.
Give it a try and let me know what you think.