hello, I react to many things, I do know a little about reactions. It sounds like as the moisture builds up on or in the layers of your skin ( moisture that contains what you are reacting to.) you develop the hives. you can test your self as to what you are reacting to. If it is the water, say chlorine, fluoride, or maybe corn syrup ( corn syrup has been added to everything for the past few decades causing many reactions. ) years ago before corn syrup I suffered from an entire body rash from coconut syrup in the same foods corn syrup is now in. Emergency rooms were full of people with the same problem, Doctors didn't know what caused it nothing worked to get rid of it. I solved the problem through process of elimination research, found out about the coconut syrup and YUP didn't eat any of it any more and rash was gone. Yay! try staying away from things that have the same thing in it that your eating, waring, drinking. become a detective. Help others to find the answers to their problems too. Some foods causing reactions are: nightshade plants, corn syrup, citric acid (made from corn not citrus fruit) it's in everything, the dye on your pillow case or sheets can cause welts and swelling, check your environment for things from china there are lots of things being recalled from China foods, clothes toys it is a serious problem. You, we need to help discover the cause of our problems we know our bodies and what we feel or don't feel as soon as we feel it.