I wish I could help you, last winter, I had a bout of hives which came up anywhere on my body where elastic touched me and additionally on my breasts at night when I went to bed or whenever I bathed. NOTE---whenever my body was warm and moist. I also had a bad case of what they call winter itch on my inner thighs. NOTHING helped this until I started getting enough water. I switched laundry soap hoping the hives would stop, I stopped wearing anything with elastic and still they came up around my waist and on my back where my bra would have been. Eventually, they stopped on their own and I never figured out what got rid of them or what started them. I suspect since they only came up in places where my skin temp went up and moistened from heat, that I was releasing toxins through the skin and when they were gone, so were the hives. I tried any number of things. Tea tree oil seemed to make them flare and burn worse but they went away faster. Hope you get this figured out soon, I know how frustrating hives can be. Sorry I can't be more help.