The 'Watch Sign' – Another Observation in the Course of Male Frontal Fibrosing Alopecia

This study explores the "watch sign," a novel observation in male frontal fibrosing alopecia (FFA), where hair loss spares the area covered by a wristwatch. The research involved two male patients, one of whom exhibited the "watch sign." The underlying mechanism is unclear, but it may relate to the Renbök phenomenon, potentially involving pressure or temperature changes from wearing a watch. The study suggests that further investigation into the "watch sign" could provide new insights into FFA pathogenesis.