Since I was about 18 I've noticed that whenever I exercise or have an increase in body temp. due to stress, adrenaline, or just warm room temperature (if I was just in a colder environment), I break out in a red rash all over my body. If I itch it at all, it becomes full blown hives. This only happens in cold weather when I'm not acclimatized to the heat, and it also subsides after extreme sweating (but before then is a problem). It also went away for about a year a while back, but then returned. I searched the net and found the condition "cholinergic urticaria" that seems to fit what I have. Does this sound right, and if so what should I do?
I also have minor psoriasis, and very dry skin, as well as multiple moles and skin tags, if any of that is relevant.