The skin itches in hot and humid weather.

Your good friend, consider eczema. Eczema is an inflammatory skin reaction. It is itching caused by some damp toxin and damp heat in the body. Clinical manifestations include itching, erythema, desquamation and herpes in groups.

Pathogenic causes: living environment, climatic conditions, cold, damp heat, dryness, genetic correlation, allergic constitution, etc. I suggest you: go to a regular specialized hospital to find the cause, and use drugs mainly to clear away heat and promote diuresis, supplemented by expelling wind.