Trichorrhexis Invaginata and Netherton's Syndrome

Trichorrhexis invaginata, also known as bamboo hair, was identified as a hair shaft abnormality where the hair shaft telescopes into itself, creating a "ball-in-cup" appearance under high magnification. This condition was pathognomonic of Netherton’s syndrome, a genetic disorder. The study highlighted the use of dermoscopy to diagnose this condition, noting the characteristic "golf tee-like" invagination when the hair shaft ruptures. The document emphasized the importance of recognizing these hair abnormalities for diagnosing Netherton’s syndrome.