Cutaneous lupus erythematosus: diagnosis and treatment.

Cutaneous lupus erythematosus (CLE) encompasses a wide range of dermatologic manifestations, which may or may not be associated with the development of systemic disease. Cutaneous lupus is divided into several sub-types, including acute CLE (ACLE), sub-acute CLE (SCLE) and chronic CLE (CCLE). CCLE includes discoid lupus erythematosus (DLE), LE profundus (LEP), chilblain cutaneous lupus and lupus tumidus. The diagnosis of these diseases requires proper classification of the sub-type, through a combination of physical examination, laboratory studies, histology, antibody serology and occasionally direct immunofluorescence, while ensuring to exclude systemic disease. The treatment of cutaneous lupus consists of patient education on proper sun protection along with appropriate topical and systemic agents. Systemic agents are indicated in cases of widespread, scarring or treatment-refractory disease. In this chapter, we discuss issues in classification and diagnosis of the various sub-types of CLE, as well as provide an update on therapeutic management.