It seems many of us have secondary skin issues in addition to the Grover's diagnosis. I suspect I may be in the same boat. In my late 20's-early 30's, I would get hives every time I took a hot shower, but that was so different. These were big welts, all over my torso, front and back. Nobody every figured out why and they mysteriously went away. Now, 15 years later, this pops up and is possibly also related to heat and/or sweat. Have any of you seen an endocrinologist and had a thorough work-up? My derm thinks that's going to be my next step if this week's blood/urine tests don't show anything abnormal. Also, (just venting here), I find it discouraging how outdated the research is considering how many people this affects (compared to the 70's) and how uncomfortable it can make us. I still have half my life ahead of me and may have to deal with this for all of it? Someone please study this further!