Itchy hands in hot weather may be caused by eczema, tinea versicolor, and herpes perspiration. 1. Eczema: It is an inflammation of the superficial dermis and epidermis caused by a variety of internal and external factors. Acute skin damage is dominated by herpes mound, with a tendency to ooze, accompanied by redness, swelling, vesicles and other symptoms; the chronic phase is dominated by mossy changes, accompanied by repeated episodes of obvious itching. Its can lead to hot weather hands itch. 2. Ringworm: refers to the palm of the hand and between the fingers of the skin ringworm infection, summer and fall incidence rate is high. It can be manifested as whitish skin impregnation, soft surface easy to peel and ooze, obvious itching; can also be manifested as blisters between fingers, palm, vesicles, desquamation, etc., accompanied by itching and so on. It can lead to itchy hands in hot weather. 3. Sweat herpes: a blistering skin disease that develops on the palms of the hands and soles of the feet, usually starting in late spring and early summer, aggravated in summer. The main manifestation of the skin cluster blisters, accompanied by itching and pain in the affected skin. There are many other causes of itchy hands in hot weather, which should be emphasized, and timely consultation should be made to identify the cause of the disease, and further treatment or therapy as prescribed by the doctor.