Well, this time I was living at a campground that has well water. I use natural glycerine soaps, mostly, but i haven't noticed a difference between using one kind or another. also natural shampoo (lately, but not always, Trader Joe's citrus one). right now i am in a wintery place with lots of snow, getting down into the negative degrees F, but that's not been a factor before (except that having to wear more clothes irritates it more, but doesn't cause it). and i was in a real warm sunny place several months ago when it flared up. but taking care of my dying grandmother. so i have to suspect that emotional issues may be a culprit. oh, i'm almost out of time on this computer...