The greasy skin is related to the age factor, and may also be related to lifestyle habits, hereditary factors, endocrine disorders and other reasons. 1. Age factor: If you are in puberty, androgen secretion increases, sebaceous gland secretion is vigorous, may lead to greasy skin easy to oil. 2. Lifestyle habits: often eat too greasy spicy stimulating food, or do not clean the skin in time, may lead to skin pore clogging, may lead to greasy skin easy to oil. 3. Genetic factors: heredity can lead to natural sebaceous gland secretion, greasy skin easy to oil. 4. Seborrheic dermatitis: It is associated with Malassezia colonization, increased lipids, impaired skin barrier function, immune response and individual susceptibility. On the basis of hereditary seborrheic qualities, the parasitism and reproduction of microorganisms such as Malassezia can hydrolyze the triglycerides in sebum, and the free fatty acids produced further stimulate the skin to produce an inflammatory response. There may be other causes of greasy skin, so it is recommended to seek medical advice and standardize treatment under the guidance of a doctor.