If I sweat and the air around is cool or breezy guaranteed I will have a reaction, I learned that yoga is a good excercise, and to always have a towel on hand to keep my skin dry as possible, for everyone it's different so be aware of what you can handle. Running and biking outside is the worst, so I take walks but make sure not to sweat, take breaks in between as not to get a reaction. I love swimming but cool water always makes me break out.