A Case of Acquired Trichorrhexis Nodosa with Iron Deficiency Anemia

This case study reported an unusual instance of acquired trichorrhexis nodosa (TN) in a 36-year-old woman, which developed following severe iron deficiency anemia (IDA). Despite no history of hair trauma, the patient experienced localized hair breakage on the scalp vertex over 2 years. Her IDA, diagnosed as idiopathic, had improved, but her ferritin levels remained low. Diagnostic tests, including dermoscopy and microscopy, confirmed TN, showing the "crushed paint brush sign" and cortical fiber fractures, with no evidence of fungal infection. This case highlighted the potential link between IDA and TN, emphasizing the importance of considering underlying conditions in hair shaft disorders.