Sleeping inside the palm of the hand itching consider ringworm, sweat herpes, insect bite dermatitis and so on. 1. ringworm: ringworm and fungal infection related, mainly through direct contact or indirect contact, at the beginning there will be some scattered small blisters, then will occur flaking or keratinization thickening, accompanied by intense itching, positive fungal examination. 2. Sweat herpes: the cause of sweat herpes is not particularly clear, mainly symmetrical small blisters occurring on the hands and feet, in the beginning there will also be itching, blisters will also be peeling after drying, this disease often recur. 3. insect bite dermatitis: mosquitoes are more in summer, the bite will produce an allergic reaction, mainly manifested as erythema, papules, and accompanied by itching. Feeling itchy inside the palm of your hand may have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.