Hi,
I know this is going to sound crazy but I'm from east Texas, possibly the chigger capital of the world (there is a annual Chigger Festival there). We used toothpaste on chigger bites and it really soothes the itchiness. Plain ol Crest toothpaste, the old fashioned white paste kind works the best and if you keep it refrigerated the coolness really feels good. I used to put a tube of Crest in the frig every summer just for chigger bites.

La Victoria