Patients with lupus erythematosus develop a rash like psoriasis or a fungal skin infection, and some people mistakenly believe that lupus erythematosus is contagious. However, lupus is actually an autoimmune disease, not a contagious disease, so there are no ways to transmit it, including physical contact with a person with lupus, or shared eating and living. At present, the pathogenesis and causes of lupus erythematosus are not clear, but some studies believe that lupus erythematosus may be related to genetic factors, environmental factors and estrogen levels, etc.: 1. genetic factors: if people have a family history of lupus erythematosus, the incidence will increase significantly; 2. environmental factors: for example, exposure to ultraviolet sunlight and some drugs and chemical reagents can increase the incidence of lupus erythematosus; 3. 3. Estrogen level: The incidence of lupus erythematosus is relatively high among female patients, and if women are of childbearing age or pregnant, the disease will be aggravated by high estrogen level. If diagnosed with lupus erythematosus, patients should actively treat the disease and consume foods containing protein and vitamins, such as eggs, lean meat and fruits. Avoid eating photosensitive foods, such as lettuce, fennel, celery, etc., to prevent causing solar dermatitis. Avoid strain and pay attention to rest. Exercise properly to enhance immunity.