The summer heat makes it easy to sweat and wash your hands relatively often. Physiological causes of summer palm peeling include excessive hand washing and local environmental dryness; pathological causes of summer palm peeling include sweat blisters or fungal infections such as lichen planus, usually triggered by frequent summer sweating. Sweat can cause environmental changes to the palms of the hands. Skin that has been soaked in sweat for a long time can lead to a decrease in the skin’s barrier capacity, which can easily trigger the above-mentioned diseases, thus causing the palms of the hands to peel.