The whole family itching, may be related to environmental factors, may also be related to food. 1. Environmental factors: due to the environment contains more sensitizers or irritants, itchy skin is easy to occur, such as the formaldehyde concentration of the newly renovated house is too high, the environment contains more pollen or mites and so on. 2. Food factors: the whole family may eat the same food or fruit, when the food is contaminated or the food itself belongs to the allergenic food, after taking it may appear itchy skin and other allergic phenomena. For the whole family appeared itchy skin, belong to the group morbidity, this situation must be timely to the regular hospital dermatology consultation, clear cause, under the guidance of the doctor symptomatic treatment.