Discoid lupus erythematosus (DLE) is a chronic skin condition that causes a red, scaly rash on the face, scalp, and other areas of the body that are exposed to the sun. It is a type of lupus, an autoimmune disorder in which the body's immune system mistakenly attacks healthy tissue. DLE is the most common type of lupus, and it is not life-threatening. Treatment typically involves topical and oral medications, as well as lifestyle changes.