Every summer, I get red pimples, which are very itchy.

It may be cholinergic urticaria (heat type): it is a symptom of urticaria after heat. Sweating during exercise, sweltering indoors, taking a hot bath, the environment getting hot, the surrounding temperature rising, eating hot food or drink, the body temperature slightly rising when the spirit is excited, and the heated blood flow stimulates the brain temperature regulation 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 obvious acupuncture sensation and severe itching. ② Generally, it appears after encountering high temperature (hot drink, hot bath), emotional excitement and exercise. When you stop exercising or calm down, the symptoms can gradually subside. In severe cases, symptoms may take months or years to completely subside. (3) Red wheals of about 2 mm often appear on the skin of the trunk and proximal limbs (except armpits, palms and soles), and there is no trace after the wheals subside. Severe cases may be accompanied by digestive tract symptoms, such as abdominal pain and diarrhea.

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