An 8-year-old Girl with Multiple Whitish Dots on the Hair Shaft: A Quiz

An 8-year-old girl was referred to our dermatology clinic with a 6-year history of multiple whitish dots on her scalp hair.The hair was slightly coarse, but she reported no significant fragility, breakage or associated symptoms such as pruritus or pain.She denied any history of hair dyeing, chemical exposure or traumatic hair handling.Her medical history was unremarkable, with no evidence of systemic disease.Notably, her younger sister exhibited identical hair abnormalities.Physical examination of the patient and her sister revealed scalp hair shafts with a characteristic banded appearance: alternating segments of normal black colour and small white-grey spots (Fig. 1).Hair tensile