What Causes Pins And Needles On Skin While Doing Workout?

I experience a skin sensation I best describe as pins and needles on much of my skin when my temperature rises, or if I m in a situation causing anxiety. It commonly occurs shortly after I begin a workout and my body temperature rises. Many of the symptoms are like those of cholinergic urticaria, but I don t experience hives. If I cool down it goes away or if I continue getting warmer and potentially sweat, it subsides and stops.