Acne, rosacea and other diseases are common. The causes of different diseases are slightly different, and the common causes include inflammatory infections, exuberant sebum secretion, mental factors, genetic factors and so on. 1. Acne: The causes of this disease are many, mostly due to abnormal levels of sex hormones, sebum secretion, abnormal keratinization of the cells around the hair follicle, Propionibacterium acnes infection of the four factors that work together, in addition, heredity, medication, diet high in sugar, hot and humid environments, stress and other factors are also prone to induce acne. 2. Rosacea: The cause of this disease is not yet completely clear, mainly associated with seborrhea, follicular helminthic mite infection, genetic factors, local vasodilatation nerve dysregulation, impaired barrier function of the skin, frequent anger, irritability and other emotional stimuli, long-term late at night, irregular life, high-temperature stimulation, endocrine disorders, immune dysfunction and other factors. It is recommended that patients usually pay attention to facial skin hygiene and cleanliness, and eat a light and digestible diet. If necessary, go to a regular hospital, after a clear diagnosis, can be reasonable treatment under the guidance of the doctor.