biostudies-literatureUnknownKo EA<h4>Introduction</h4>Frontal fibrosing alopecia (FFA) has been associated with hair cosmetic habits, yet causality and frequency-dependent effects remain uncertain. This study aimed to evaluate the association between hair care habits and FFA.<h4>Methods</h4>An analytical case-control study was conducted including 115 FFA patients and 112 matched controls, evaluated at the Hospital Italiano de Buenos Aires between 2015 and 2024. Participants reported current hair washing frequency, cosmetic hair practices, leave-in-product use, and sunscreen use; FFA cases also reported habits 5 years before symptom onset. Logistic regression models were performed.<h4>Results</h4>Decreasing hair washing frequency was associated with progressively higher odds of FFA (adjusted OR 18.7 for washing ≤1 time/weeSkin appendage disordershttps://www.ebi.ac.uk/biostudies/studies/S-EPMC12707933biostudies-literatureHair Care Habits and Frontal Fibrosing Alopecia: A Case-Control Study.PMC12707933Rangel MAbed MNavarro Tuculet CCappetta MEEcheverria MKo EAMazzuoccolo LDfalseHair Care Habits and Frontal Fibrosing Alopecia: A Case-Control Study.<h4>Introduction</h4>Frontal fibrosing alopecia (FFA) has been associated with hair cosmetic habits, yet causality and frequency-dependent effects remain uncertain. This study aimed to evaluate the association between hair care habits and FFA.<h4>Methods</h4>An analytical case-control study was conducted including 115 FFA patients and 112 matched controls, evaluated at the Hospital Italiano de Buenos Aires between 2015 and 2024. Participants reported current hair washing frequency, cosmetic hair practices, leave-in-product use, and sunscreen use; FFA cases also reported habits 5 years before symptom onset. Logistic regression models were performed.<h4>Results</h4>Decreasing hair washing frequency was associated with progressively higher odds of FFA (adjusted OR 18.7 for washing ≤1 time/wee2025-01-01T00:00:00Z2025 Nov2026-06-06T04:03:13.216Z2026-05-25T03:12:00.33ZS-EPMC127079334140952910.1159/000549427