Silicone is a polymer with stable physical and chemical properties, non-irritating and non-antigenic to the human body. Silicone membrane treatment of scarring mechanism has not been fully elucidated, most scholars believe that the silicone gel membrane may be through the “hydration” effect, that is, after the use of silicone membrane, the scar surface water evaporation is reduced by about 50%, the water in the skin is transferred to the stratum corneum, the interstitial soluble substance is reduced, the hydrodynamic pressure is reduced, thus making the scar tissue Softening. It has also been suggested that there is an electrostatic effect between the silicone membrane and the scar tissue. For the role of water retention, some people reasoned as follows: silicone membrane adhesion can play the role of normal keratin, reduce the evaporation of water, thereby reducing the local demand for capillaries, inhibiting the regeneration of capillaries, which also reduces the deposition of collagen. Silicone membrane on scar treatment may include: ① electron microscopy see silicone membrane has pores can allow oxygen through, to ensure that the skin oxygen respiration, but also measured the partial pressure of oxygen under the silicone membrane proved to be the same as the ordinary scar surface oxygen partial pressure, silicone oil oxygen solubility than plasma and saline more than 10 times higher than that of the mice will be completely immersed in silicone oil can still get enough oxygen to survive for 6 hours. ②Silicone membrane under the skin stratum corneum has water retention, its humidity and normal skin with the same, water is absorbed by the skin, can protect the skin and soften the skin. The evaporation of water on the surface of the scar after applying the silicon film will be only half of the original. ③ There is silicone oil under the silicon film, which plays a certain therapeutic role. In such an environment, there is no cell growth, and the silicone oil also has the effect of softening the scar. In addition, scarring is common in a large number of plasma proteins penetrate into the interstitium, resulting in interstitial edema, increased pressure which is one of the reasons for inducing vascular and fibrous tissue proliferation. After using silicone membrane, the water content of skin stratum corneum increases, so that the permeability of water-soluble proteins and water-soluble inflammatory exudates in the interstitium increases, and they rapidly diffuse on the surface of the scar, so that the protein in the scar decreases, the pressure decreases, and the scar softens. At present, the effective rate of treating hyperplastic keloid with silicone film is more than 80%. Silicone film usage and precautions are as follows: 1, cut into the appropriate size on the clean scar, the range slightly more than normal skin; 2, silicone film and scar between the gap, to be completely closed dressing; 3, each silicone film can be repeated every day, try to stick 24 hours a day, you can take off the bath, the silicone film with water and detergent to wash and dry. Take a good bath and then paste it on, really no adhesion and then replace; 4, located in the limbs of the scar, in the pasted silicone film, and then set of elastic sleeve, not only can fix the silicone film, but also due to the compression of the elastic sleeve to promote the softening of the scar shrinkage; 5, if the use of parts of the rash, redness, swelling, itching and irritation need to be temporarily discontinued, to be localized to restore the skin to normal can be tried to use again.