Lupus profundus limited to a site of trauma: Case report and review of the literature.

Lupus erythematosus profundus (LEP) is a rare form of chronic cutaneous lupus erythematosus. We report on a case of a 56-year-old Caucasian woman who presented with a single, persistent, painful rash on the left hip and lateral aspect of the left upper thigh, which had been present for 2.5 years. The patient had a history of previous injury to this area before the rash started. Clinical findings showed an inflamed, hyperpigmented, and indurated plaque with a linear skin invagination and no associated systemic symptoms. A skin biopsy test result confirmed the diagnosis of LEP and the clinical and laboratory examinations ruled out systemic lupus erythematosus. After 2 months of treatment with methotrexate 20 mg weekly and 1 month of prednisolone 7.5 mg daily, the skin rash improved considerably. We also present a brief review of the epidemiology, etiology, clinical features, histopathology, laboratory findings, differential diagnosis, and treatment of LEP.