Boy’s Unruly Patch of Hair – What’s the Diagnosis?

The mother of a 7-year-old boy asked about a patch of unruly hair on the occipital area of her son’s head. Until about 9 months ago he had always had a very short haircut, but now that he wanted to grow his hair longer, they noticed that this area always seemed very kinky, a little bit lighter in color, more fragile, and easily tangled. At first his mother thought it was because he didn’t comb it before bedtime, but no amount of care made a difference. No one else in the family had very curly hair or a similar patch of hair, and he was otherwise healthy.

Is it uncombable hair syndromecongenital pili tortiwoolly hair nevus, or trichorrhexis nodosa?

Check out our differential in VisualDx.

The correct diagnosis is…

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