Whether long transparent blisters on the hands is infectious or not, can not be generalized, should be decided according to the cause of the disease, the common diseases are sweat herpes, eczema, herpes simplex, herpes zoster, hand, foot and mouth disease, ringworm and so on. 1. hands long transparent small blisters, not contagious situation: for example, sweat herpes, eczema, contact dermatitis, drug rash, polymorphic erythema, external stimulation caused by transparent small blisters, not infectious. 2. hands long transparent small blisters contagious situation: viral infection caused by herpes simplex, herpes zoster, hand, foot and mouth disease, etc., is contagious, fungal infections caused by blisters caused by tinea cruris, is also contagious. The hand long transparent small blisters, it is recommended to go to the hospital for examination, clear cause of disease follow the doctor’s instructions for treatment.