Sebaceous cysts are caused by the blockage of sebaceous ducts. It is caused by the blockage of sebaceous gland ducts. It is mostly considered to be caused by unclean skin, long-term use of hormone drugs, dietary habits and other reasons. 1. Unclean skin: Unclean skin can easily lead to sebaceous cysts caused by blocked hair follicles. Attention should be paid to maintain skin hygiene, can minimize the incidence of acne. 2. Long-term use of hormone drugs: such as prednisone and other glucocorticoid hormone drugs, will affect the endocrine and lead to sebaceous gland duct obstruction, this situation should be timely to the hospital, give timely intervention measures to adjust the treatment program. 3. Dietary habits: Dietary love to eat fried, spicy stimulating food, smoking and drinking, late at night, overwork will appear skin diseases, and stimulating food will also stimulate the rapid growth of sebaceous cysts. Therefore, you should pay attention to your daily diet. Usually to develop good personal hygiene habits, prohibit spicy stimulating and greasy food, pay attention to rest, regular rest and relaxation, usually also pay attention to the diet, when the symptoms are found in a timely manner care and intervention, to avoid infection, delay the disease.