Linear atrophic lesion on forehead.

A 17 year old girl presented with asymptomatic linear depressed groove involving the midline of the forehead region which was progressively increasing over the past 1 year. The lesion was slowly extending to the scalp which became a major concern to the patient. There was no history of trauma preceding the development of the lesion. On examination, an ivory sclerotic depressed linear lesion mainly involving the mid forehead with slight extension to the scalp was noted (Fig. 1). No other remarkable cutaneous or systemic finding was noted. We considered a differential diagnosis of “en coup de sabre” morphea, and linear atrophoderma. On histopathology, squared-off edge of the biopsy specimen with mild superficial and deep inflammatory infiltrate with collagen fibres, so a diagnosis of “en coup de sabre” morphea was made.