Dry skin means that the skin lacks moisture, the skin is tight, some parts are dry and peeling, and the whole body itches after bathing. Age, climate change, lack of sleep, excessive fatigue, overheated bath water and strong alkalinity of washing products are all important causes of dry skin. Preventive measures are to strengthen the daily care and maintenance of the skin, rationally adjust the diet structure, insist on drinking more water and eating more fruits, and adjust the work and rest time not to be overworked.

Skin is generally divided into epidermis, dermis and subcutaneous tissue from outside to inside, and epidermis is divided into stratum corneum, transparent layer, granular layer, spinous layer and basal layer. The outermost stratum corneum of skin plays an important role in the integrity of skin barrier function. There is a layer of sebum film on the stratum corneum, which is a translucent milky white film formed by emulsification of sebum, sweat and epidermal cell secretions. Free fatty acids, lactate, urea and uric acid in sebum membrane are natural moisturizing factors, which can moisturize the skin. The stratum corneum and sebum membrane can prevent the loss of skin moisture. Under normal circumstances, the water content of the stratum corneum should be around 10%, below this level, it is water-deficient skin; Using Australian lanrou sheep oil or massage to maintain or exceed this water content shows that the skin is in a good moisturizing state and has reached an excellent state.