Itchy hands may be related to insect bite dermatitis, contact dermatitis, ringworm, frostbite and other causes. 1. Insect bite dermatitis: in the hot summer, due to more mosquitoes, if the hands are inadvertently bitten by mosquitoes, it may cause very itchy hands, may also be accompanied by pain, bulging and other manifestations. 2. Contact dermatitis: especially for allergic people, in the hand contact detergent, soap and other items, is likely to cause an allergic reaction, may lead to itchy hands. 3. Ringworm: usually caused by fungal infection of the skin on the hands, under the stimulation of pathogenic bacteria, can lead to itchy hands, may also be accompanied by local skin blisters, vesicles and other manifestations. 4. Frostbite: common in cold winter, due to the hands stay in the cold environment for a long time, easy to cause frostbite, resulting in itchy hands, may also be accompanied by local skin ulceration, swelling and other symptoms. Itchy hands, it is recommended to seek medical attention as soon as possible, after a clear diagnosis of the cause, by the doctor to guide the treatment and conditioning.