Vaseline has the functions of moisturizing and repairing skin, and can relieve skin dryness and various skin problems caused by dryness, so that the skin can maintain a state of strong self-repairing ability and is not easy to leave scars. Vaseline is a semi-liquid mixture of alkanes or saturated hydrocarbons, also known as petrolatum, which is fractionated from petroleum. Its state is between solid and liquid at room temperature, and it has three colors of brown, yellow and white according to different uses. Vaseline has the smell of mineral oil and can be used as a raw material for medicines and cosmetics. Dermatology usually uses vaseline as the matrix to prepare various ointment-type external drugs to treat various chronic skin diseases. Vaseline can keep the skin moist, keep the skin tissue at the wound in the best condition, and accelerate the skin's own repair ability. Vaseline is often used in lipstick or hand oil, which has a very good skin care effect. Vaseline can moisturize and repair the skin, improve the repair ability of skin tissue at the wound, prevent the ulcer from contacting with acidic substances in the mouth, accelerate the healing of the ulcer and remove the blackheads on the nose. Therefore, vaseline has been widely used in dermatology.