Hello, this is cholinergic urticaria. Such is also the case with me. I am in pain. Going to the gym will cause allergies, and sunbathing in summer will cause acupuncture pain. There is no other way but to keep the window open during exercise, not to let your body temperature get too high, and to wipe your sweat frequently. You must take a bath after exercise, but the water temperature can't be too high, which can also cause allergies. If it really doesn't work, take anti-allergic drugs, such as Kairuitan and Sismin. I always take it with me when I go to the gym. Cholinergic urticaria is a kind of rash that people often say. When you are hot, nervous, eating hot food or drink, or after exercise, your body temperature rises slightly. The heated blood flow stimulates the brain's thermoregulatory center, excites cholinergic nerves and releases acetylcholine. It is precisely because people are allergic to acetylcholine that we call the symptoms caused by allergies cholinergic urticaria. Symptoms and characteristics of cholinergic urticaria ① There is no rash, but you obviously feel tingling and severe itching. ② It mostly happens in youth, usually after encountering high temperature (hot drinks, hot baths), emotional excitement and exercise. When you stop exercising or calm down, the symptoms will subside. In severe cases, symptoms may take months or years to completely subside. (3) Red wind masses of about 2 mm often appear on the skin of the trunk and proximal limbs (except armpits, palms and soles), which come and go quickly and leave no trace. Severe cases may be accompanied by digestive tract symptoms, such as abdominal pain and diarrhea.