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Case 1: A 5-year-old boy presented with a 30-day history of an asymptomatic area of brittle, lustreless hair, which broke easily after emergence from the scalp. He had no significant past medical history. His family had acquired a domestic cat 2 months previously, which was healthy and had normal fur. On examination, a 5×5 cm area in the parieto-occipital region showed thin and white scales, with tonsured and easily removed hair (figure 1).
Case 2: An otherwise healthy 5-year-old girl had a 3-month history of localised hair rarefaction. No local symptoms or previous lesions were reported. She had been living in a household with cats for 6 months. Examination of the skin showed a 10×6 cm area of thin and sparse hair of many different lengths in the right parietal region. The hair-pull test was negative. The scalp was smooth and non-scaly (figure 2).
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