Erythema on the hands is considered to be contact dermatitis, ringworm, insect bite dermatitis and other diseases. 1. contact dermatitis, the patient’s hand skin contact irritating or sensitizing substances after the occurrence of inflammatory reaction, may lead to skin erythema, at the same time there may be itching, swelling and other symptoms. 2. Ringworm, if the contact with fungi may lead to ringworm, so there will be erythema on the hands, and there may be itching, blisters, vesicles, skin thickening and other symptoms. 3. Insect bite dermatitis, the skin by mosquito bites may produce insect bite dermatitis, erythema symptoms on the hands, but also may lead to itching, pimples and other symptoms. Usually need to pay attention to do a good job of personal skin care health care work, if there is discomfort is recommended to actively seek medical attention.