Itching all over the body when you are hot is considered to be cholinergic urticaria, which may also be related to eczema, contact dermatitis and other conditions.
1. Cholinergic urticaria: due to heat, exercise and other circumstances lead to a rise in body temperature, so that the body of acetylcholine active in the mast cells, there will be itching, doughnut-shaped pimples, burning sensation and tingling sensation and so on.
2. Eczema: related to a variety of external factors, belongs to the skin inflammatory reaction, the typical symptoms of skin erythema or papules, papules, basal redness, and accompanied by intense itching.
3. Contact dermatitis: caused by contact with certain allergenic substances, manifested as reddish edematous papules on the skin, with itching symptoms.
This symptom, should promptly seek medical attention to clarify the cause, and by the doctor’s guidance standardized treatment, so as not to delay the condition.