Keywords: FFA, frontal fibrosing alopecia; RCM, reflectance confocal microscopy; acanthosis; alopecia; cicatricial alopecia; compound follicle; dermatoscopy; follicular hyperkeratosis; frontal fibrosing alopecia; interface dermatitis; lichen planopilaris; lichen planus; lymphocytic; pathology; peripilar cast; reflectance confocal microscopy; transverse sections; trichoscopy.