Lupus erythematosus can appear on various parts of the body. The most typical rash is the butterfly rash on the face, but it can also appear on other parts, such as discoid lupus, annular erythema, periungual erythema, and livedo reticularis. Additionally, systemic lupus erythematosus affects not only the skin and mucosa but can also involve the lungs, kidneys, heart, central nervous system, and other systems. Common manifestations include lupus nephritis and lupus pneumonia. The precise pathogenesis of systemic lupus erythematosus is still unclear. If the damage is confined to the skin and mucosa, immunomodulators such as hydroxychloroquine can be used for treatment. If important organs are involved, it generally requires long-term maintenance treatment with corticosteroids combined with immunosuppressants to control the progression of the disease.