Use salt water on your face, usually for 15-20 minutes is more appropriate. Saline face compresses mainly refer to the use of 0.9% physiological saline, but can not use salt water. The concentration of physiological saline is the same as the concentration of tissue fluid in the human body, so using saline on the face can effectively increase skin hydration and regulate the discomfort of dryness in the facial area. Each compress for 15-20 minutes can make physiological saline through the epidermis into the subcutaneous, both to achieve the desired effect, but also to avoid a long time external compress caused by epidermal permeability increased. If the skin surface is dry, the wet compress time can be extended to about 30 minutes to increase the water content of the skin, but the wet compress must be used after the moisturizing skin care products, otherwise the skin will be more dry. Not everyone is suitable for wet compress with salt water, if the face area appears obvious discomfort, or recommended to go to the local hospital, under the guidance of the doctor symptomatic treatment is more secure.