Chiggers sound right to me, but it could also be scabies. I was helping a friend once, as she was rescueing some dogs from a puppy mill. The dogs were covered with mange. She and I, and her 16 year old son were unloading the dogs, the young kids, we kept away. Later that evening, her son comes into the kitchen and lifts his shirt. He had a red rash like ring around his middle. They made a little ridge-like tunnel, and if you put some ointment on the tunnel, you had missed them. I found an old vet book that had a recipe for them. It called for,"flowers of sulphur", lard, and pine tar mixture. Well, I would be darn if I'm wearing pine tar! So, I found a small jar of the flowers of sulphur in the super market, and we mixed a thick paste with lard. Vaseline works just as well I later found out! Trick is, to spread it out all over the area, and at least 3" in every direction from the little tunnels!! If it worked for the scabies, I bet it would work on chiggers as well. Cheap fix, it only cost around $8.00 all totaled, not to mention we didn't have to go to a doctor and pay out the wazoo for some chemical treatment, and then be humiliated on top of it.