You story sounds a lot like mine. I went through nearly two years of mystery rashes culminating in macerated weeping patches under my arms. I went to multiple practitioners, including two dermatologists before getting the correct diagnosis and treatment. What I was told at Mayo was that I had become sensitive to products that I had been using for a long time. I changed by skin care to Vanicream products: soap, deodorant, moisturizer, skin screen. I had been using the same botanical/natural line for 18 years and discovered I had reactions to oils of many botanicals, shea butter, beeswax, which I hear is actually quite common. I switched to Tide Free & Clear. The changed their formulation recently and switched to All Free which has caused no problems. I found some face products after a bit of trial and error and I am still trying to find hair products that work for my curly, dry hair. I had a barrage of allergy tests that only showed a mild reaction to one ingredient used in suncreen. It is suggested that I have more test done; this time to fabrics. I also changed dish soap to Palmolive Pure & Clear.