Very greasy skin, i.e. excessive oil secretion by the skin, may be caused by endocrine disorders, dietary factors, and some nutrient deficiencies. 1. Endocrine disorders: patients may be in puberty, physiological endocrine disorders, or endocrine disorders caused by endocrine system diseases. Androgen level can be increased, which enhances the secretion function of sebaceous glands and causes excessive oil secretion. 2. Dietary factors: patients with frequent consumption of fried food, sweets and other dietary habits, may lead to sebaceous gland secretion function, resulting in excessive secretion of oil. 3. Part of the nutrient deficiency: such as vitamin B6 and other nutrient deficiencies, can cause the sebaceous glands of the skin secretion function is abnormal, resulting in excessive secretion of oil. In addition, excessive oil secretion of the skin can also be seen in other cases, it is recommended that the patient go to the hospital to do the relevant examination in a timely manner, to clarify the cause of the disease and follow the doctor’s instructions for treatment, so as to avoid delaying the condition.