Fleas? Are you sure it is not a case of good ole Texas chiggers? Speaking from experience, I had a nature call, went behind some brush, dropped my pants and took care of the job. Back at the camp that night I started itching pretty bad, after digging for a while I finally inspected myself and found I was covered with the little devils, bites in places I don't want to talk about. Its ten PM, but I am off to the local Wal-Mart looking for relief, the pharmacist recommended a product that provide some help and directed me to sporting goods for a insect repentant that contained DEET. It took about two weeks for the sores to heal up and itching to go away, that’s even with at least one daily soak in a tub of hot Epsom salts water.