The body itches when it is hot. What kind of skin disease is it?

The symptoms you are talking about are cholinergic urticaria, which belongs to a rash that people often say. When you are hot, nervous, eating hot food or drink, or after exercise, your body temperature will rise slightly. The heated blood flow stimulates the thermoregulatory center of the brain, 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. You can use Kangmei Cholinergic Urticaria Suit to treat this, and the effect is very good.