A Case of Trichorrhexis Nodosa Localized to the Parietal Area / 대한피부과학회지

ABSTRACT

Trichorrhexis nodosa is the most common hair shaft anomaly in which there is a distinctive response to injury. The hair is fragile and on examination pale `node-like' swelling may be observed. It may affect normal hair following excessive or repeated trauma, or may occur after minimal trauma if there is an inherent defect in keratin synthesis causing abnormally brittle hair. We report a case of localized trichorrhexis nodosa in a 42-year-old male who had scratched frequently for the relief of the pruritus in the parietal area. Scanning electron microscopy revealed longitudinal fissures and fracture in the cortex. A paint brush effect was noted at the site of fracture.