Here's my situation. I get hives on my stomach AFTER showering and getting sweaty, but the thing is when I shower, I don't get them in the shower, but only after it. I get them only on my stomach, and I also get them while I'm cutting the grass, since I get sweaty, and while swimming. I went to the doctor, and he said that it's probably from my body temperature rapidly changing, but I'm not 100% sure. He said not to worry about it, however it looks really bad, and now I have to swim in a water shirt. Plus, school starts in a month and we have swimming this year, and you're only required to wear trunks, so I don't want people to see all of the hives on my stomach and make fun of me. I was recently on a trip to the beach, and when I first got in and out of the ocean everyday, I got them, but after getting in and out multiple times over the course of a day, they went away. And the hives are really itchy and uncomfortable. I really don't think this is a water allergy, but I'm not 100% sure. But please, can someone help me, and tell me what I can do to stop this. I want these gone by when school starts. Thank you very much!