Loose Anagen Hair Syndrome

A 6-year-old white girl with blonde hair presented to the dermatology clinic with a 6-month history of hair that would not grow longer than her jaw line. Examination revealed thin blonde hair extending to the nape of the neck. The hair on the posterior scalp was unruly with waves and there were no specific patches of alopecia. She was bald until 2.5 years of age. Family history was negative for a similar disorder. Hair pull test revealed painless removal of >40 hairs. Microscopic evaluation of hairs revealed a majority of anagen hairs with a ruffled proximal cuticle and misshapen hair bulbs.

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