I think am suffering from Cholinergic urticaria, whenever I do workout or eat spicy food, or even just be in sun for a long time which increases my body temperature, my body begins to develop rashes and cause heavy itching specially on my chest, back, and sometimes on my head and arms. The skin gets reddish in color, though they disappear quite quickly like within 5 mins or so everything gets normal except that my brain isn't working properly after the rashes disappear. Sometimes I feel dizziness after such an act. After researching about the disease called Cholinergic urticaria, I think I am suffering from this, though would love to hear from a medical expert to tell me if there could be something else happening and what medications shall I look for in order to get rid of it completely. Thanks for taking the time to read about my medical condition. Looking forward to hear from you soon.