Here is what you all have been waiting for in my opinion. First, I am not a doctor, but I have had my spot checked out by one. I read the entire thread and it seems most of you have this happen on your arm. Mine actually happens about 2 inches below my belly button and to the left side. When I was younger, I went through a two week battle with hives all over my body, so I knew what they felt like and figured this is probably what it is. Never found out what brought them on as a kid and I still don’t know. But, my spot, that is raised and itches for about 30 minutes and goes away was in fact diagnosed by my doctor as a hive. Thank God it isn’t all over my body and comes back in the same spot. When it pops up, which is usually at night, I take two Benadryl and go to bed. The next morning, it’s gone and only comes back every so often. What I’m saying here is in no way better than getting it checked out by a doctor, but hopefully it puts some of you at ease about what it is.