Skin oil is a normal physiological phenomenon, if the oil is serious, may be due to skin dehydration, improper diet, sebaceous gland secretion and other factors. 1. Skin dehydration: If the skin is too dehydrated, the body out of the body’s self-protection, will increase the secretion of oil to play the role of moisturizing the skin, to protect the body. 2. Improper diet: daily diet of spicy stimulation, greasy, fried and other high-calorie, high-fat food, will promote skin oil secretion. 3. Sebaceous gland secretion: adolescents in puberty, or oily skin patients, their own sebaceous gland secretion is more exuberant, there will be obvious phenomenon of more skin oil. Skin oil is a normal phenomenon, if the oil is serious should do a good job of daily cleaning, pay attention to light diet, to avoid excessive oil secretion and cause other skin diseases.