We finally figured out what was cause the itching crazy itching stinging thing I was going crazy from it right after we moved into our new house that was gutted, and the contractors had sheet rocked over the black mold and of course we did not know that and they did not connect some of the pipes our house looked like a brand new house ...so that itchy crazy crawling sensation was the very first sign when we moved in . MD could not figure it out, then dry red eyes, still not doctor then a couple years past and I went through what I call a near death experience every couple months before I was finally diagnosed mycotoxins poisoning then the sheet rock cracked and guess what black mold hidden behind the wall and no odor it was a nightmare of nightmares we remediated and moved and started recovery . This insanity took five years of life that I cannot get back. Just because you cannot see it or smell it does not mean it is not there.