Linear discoid lupus erythematosus mimicking en coup de sabre morphea: A case report

Discoid or chronic lupus erythematosus is an autoimmune disease that produces skin lesions on the face and scalp. Rarely do lesions present with linear configuration, but when they do, the lesions often follow the lines of embryologic migration. A 24-year-old man presented with a slowly progressing asymptomatic violaceous linear patch running from the root of his frontal scalp to the nasal tip. A Doppler ultrasound and skin biopsy were performed and the histological findings demonstrated characteristic findings of discoid lupus erythematosus. A full physical examination, review of systems and laboratory investigations showed no indication of systemic lupus. High potency topical steroids and calcineurin inhibitors were prescribed along with photoprotection. At 4-month follow-up, all his lesions had mostly cleared. We report here the first case, to our knowledge, of discoid lupus erythematosus with en coup de saber presentation mimicking morphea.