Solitary circumscribed alopecia

A 9 year old girl presented with a solitary hairless area on the left side of her scalp that was first noticed when she was aged 3 years but had not progressed over time. The girl was in good health and had no history of trauma, pruritus, or discomfort in the area. On physical examination an oval non-cicatricial (non-scarring) alopecic patch was observed in the left frontotemporal region (fig 1). Dermoscopy showed hairs of variable diameter and length, white hairs, vellus hairs, and empty follicles (fig 2). No fungi were detected on direct microscopic examination.bmj;384/feb22_2/e076986/F1F1f1Fig 1Oval non-scarring alopecic area in left frontotemporal regionbmj;384/feb22_2/e076986/F2F2f2Fig 2Dermoscopic image showing hairs of variable diameter and length, white hairs (circle), vellus hairs (triangle), and empty follicles (arrow)QuestionsWhat are the differential diagnoses?What is the most likely diagnosis?How would you manage this condition?Answers1.What are the differential diagnoses?Differential diagnoses include alopecia areata, temporal triangular alopecia (TTA), sebaceous nevus,…
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