Histopathological differential diagnosis of frontal fibrosing alopecia and fibrosing alopecia in a pattern distribution

Frontal Fibrosing Alopecia (FFA) and Fibrosing Alopecia in a Pattern Distribution (FAPD) are forms of primary cicatricial alopecia, classified as subtypes of lichen planopilaris (LPP). FAPD and FFA may present with clinical overlap and similar histopathology and dermoscopy features. Parietal scalp involvement with frontal hair line recession can obscure the clincial deliniation between FAPD and FFA. The aim of this study is to establish whether FAPD can be differentiated from FFA by histopathological analysis.