It is a chronic inflammatory disease that occurs in the middle of the face, mostly in middle-aged people between the ages of 30 and 50, more in women than in men, but severe cases are usually seen in men. The exact cause of rosacea is unclear, and a variety of factors may trigger or aggravate the disease, including local vasodilatory nerve dysregulation, follicular worms and recurrent local infections, use of spicy foods, alcohol consumption, hot and cold stimuli, mental stress, emotional excitement, and endocrine dysfunction. In recent years, H. pylori infection and the relationship between immune factors and this disease have also begun to attract attention. The course of the disease is slow, usually divided into three stages, and there is no obvious boundary between the stages: 1, erythema capillarum dilatation stage: manifested as erythema mainly in the middle of the face, but also accumulated cheeks, forehead and chin. Initially, the erythema can be obvious when eating spicy and stimulating food, sudden change in temperature and mental and emotional tension and excitement, and then become persistent erythema, and gradually appear capillary dilation in the shape of dendrites, mainly distributed in the tip of the nose and nose. It is often accompanied by enlarged pores and increased sebum secretion. It can last for several months to several years and then turn into papulopustular stage. 2. Papulopustular phase: On the basis of erythema and capillary dilation, acne-like follicular papules and pustules appear repeatedly, but no acne is formed. The lesions may sometimes appear as deep inflammatory nodules or cysts. 3, nasal superfluous period: due to long-term congestion, repeated infection, connective tissue proliferation and abnormal enlargement of sebaceous glands in the nose, the formation of elevated nodules of different sizes, resulting in the appearance of the tip of the nose hypertrophy, deformity such as superfluous. The enlarged sebaceous glands are visible on the surface of the nasal redundancy, and when squeezed, there are streaks of white sticky sebum overflowing. Severe nasal redundancy is mostly seen in men over 40 years old. 4, eye: mostly seen in postmenopausal women and nasal superfluous period of men. The manifestation is blepharitis, conjunctivitis, occasionally causing keratitis and iritis, patients may have dry eyes, foreign body sensation, tearing, photophobia, blurred vision and other symptoms.