When my body get heat up due to excercise or sun i get something on my skin that looks like pimples on all over my body which produce itching?

Heat rash is common in persons living in warm or hot humid places. The skin reaction lasts typically until the skin has cooled down. The best treatment is to cool the skin using cold compresses, ice, water or aloe gel. In extreme cases, your Dr may prescribe steroid creams. Prevention involves wearing moisture wicking fabrics, taking breaks from the sun, spending time in a cool environment.

It’s called “Cholinergic Urticaria” or easier,a physical urticaria.It seems to happen bc you are allergic to high temperatures&your own sweat.Some people show it when they user hot shower or they’re nervous.They have:low blood pressure,weak/fast pulse,belly cramps,nausea,diarrhea,shortness of breath Try taking Cetirizine 20 min before exercise&carry a wet cold face towel. If tongue swells,go to ER