It could also be friction due to your clothing.
The rash could just be due to blood vessels dilating in the heat.
I sometimes get a splotchy rash-like thing on my stomach, etc when showering.
Thank you so much for replying to my post. I am hoping that you are all right and that it is not some sort of blood or vessel issue. I really don't feel that it is related to any sort of clotting thing as it has been occuring at random times over the last 10 or so years. I do feel that you are all right about the blistering rash being something fungal or caused by fabric rubbing on the skin. Thanks again, to all of you, for your support!
I bet it is a type of fungal rash from the sweat. Make sure your clothes are washed every time you wear them. I have heard of this before so you are not alone.
My husband got the same thing!! It is from the sweat and your clothing rubbing when you were moving around!! The dr just gave my husband a cream to put on and it went away!! But i does come back around every summer!!
it probably is a heat rash or your allegic to the material...don't wear jeans when exericising it causes heat rashes..put some nelsporn on it...brittany