Good Afternoon, Honestly, I can t help but chuckle a little bit when I read some of the recommendations being made by certain physicians. I was/sometimes/do/periodically experience the same signs and symptoms as many have stated. I was having the same problems: chest tightness, difficulty breathing post showering, rashes, and the like. The problem is toxic black mold growing 1.) in the shower, 2.) behind the PVC boarding, on the shower window shelf, on the shower doors, the shower walls, on the ceiling, on the light fixture, behind the baseboard trim, under the Vinyl flooring in the wooden floorboard, and on top of anything in the bathroom that has not been properly cleaned and disinfected. MY MOLD PROBLEM IS ON-GOING. It manages to grow everywhere once you have it in the home and it keeps coming back over and over until the home is 100% remediated, making it free of mold from the inside out. If you don t get rid of it all, it causes a condition of long-term passive problems until it becomes an unexplained long-term illness that eventually becomes or causes an acute condition or life threatening illness. I hope this information is helpful. It took approximately three years of my life allotment using the scientific method of hypothesis, testing, and outcomes to determine that the problems I had with my head, lungs, skin, and body were connected to the introduction of a mold tainted window air conditioner that infected the entire home since 2011. Hope this information proves helpful and useful. All the best, MDM, Fresno, Ca