I have had the same problem you all are speaking of which is the reason I was looking through these posts. I had several bouts with PI after gardening until one year when it was awful to the point of scars being left on my arms. That bout caused people to recoil when they looked at my sores and took me months to get rid of. Since then I have had itching from time to time with small bumps (not red) on my arm. I try to refrain from touching the bumps and they usually subside within a day. People just kind of laugh at me when I relate it to the bad bout I had but I know that familiar feeling.
