The cause of lupus erythematosus is not yet very clear. It is generally believed that the disease is caused by a combination of factors including genetics, environment, estrogen levels, and drugs, leading to immune disorder and consequently the onset of this disease. Studies have found that factors directly related to the onset of lupus erythematosus include ultraviolet rays causing apoptosis of epidermal cells, exposure of new antigens becoming autoantigens, and infections; Other possible related factors include drugs such as hydralazine and isoniazid, as well as food dyes, hair dyes, celery, figs, mushrooms, smoked foods, psychological stress, etc.; it may also be related to factors such as tobacco, vinyl chloride, asbestos, and vaccinations.