The erythema triggered by lupus erythematosus may or may not be itchy, varying from person to person, with each individual's condition not being entirely the same. The erythema caused by systemic lupus erythematosus also presents very differently clinically, with the typical manifestation being a butterfly-shaped erythema on the face. Other common forms include discoid erythema, reticular purpura, polymorphic rash, periungual erythema, and more. The specific pathogenic mechanism is currently unclear, and in some patients, the condition is caused by photosensitivity. After treatment, the erythema cannot completely disappear in a significant number of patients, leaving some pigment deposition. If only the skin is affected, treatment can involve the topical use of tacrolimus ointment or the oral intake of immunomodulators like hydroxychloroquine, and if necessary, oral corticosteroids may be administered.