Alopecia areata and frontal fibrosing alopecia: dimorphism by concurrence.

We report an unusual case of concurrent scarring and non-scarring alopecia caused by two distinct disorders. A 78-year-old lady presented with a six-year history of progressive recession of the frontal hairline preceded by longstanding eyebrow and body hair loss. She also reported more recent development of discrete patches of hair loss on the right temporal and left occipital scalp. On examination, there was a band of hair loss affecting the frontotemporal scalp with cutaneous atrophy and hypopigmentation. Perifollicular erythema and hyperkeratosis were noted at the frontal scalp margin.