Most of the itchiness on the body after exercise is due to allergic dermatitis caused by the large amount of sweating in the body after exercise and the irritation of the skin by sweat. If the symptoms are mild, oral loratadine tablets can be taken. If the effect is not good, it can also be treated by infusion of calcium gluconate and dexamethasone intravenously. If the symptoms are more severe, you need to go to a regular hospital dermatology department for a comprehensive examination to find the allergenic source and treat it according to the examination results to avoid delaying the disease and causing unnecessary difficulties in future life.