Erythema on the hands to consider eczema, contact dermatitis, ringworm and other diseases. 1. Eczema: acute eczema can be manifested as erythema on the basis of the needle tip to grain size papules, papules, when serious, small blisters, conscious itching; chronic eczema can be manifested as skin infiltration on the dark red patches on the pimples, scratches and scales, localized skin thickening, can lead to erythema on the hands. 2. Contact dermatitis: is due to skin contact with a certain kind or a few kinds of irritating substances. The lesions are confined to the contact area, manifesting as erythema, papules and small blisters with clear boundaries. In severe cases, large blisters can appear. Vesicles ooze out after scratching. 3. Ringworm: it can be manifested as red papules, papules or small blisters on the hands, followed by the formation of scaly red patches, with clear boundaries, the edges expanding outward, and the center tends to subside, forming a clear ring or multiple rings. Erythema on the hands may also be other diseases, it is recommended that patients go to the hospital in time to do the examination, symptomatic treatment.