A Novel Atypical Presentation of Frontal Fibrosing Alopecia Involving the Frontoparietal Scalp.

Frontal fibrosing alopecia (FFA) is a progressive scarring alopecia of unknown etiology that classically presents with a band of hair loss along the frontotemporal scalp. We report a case of FFA involving a band of alopecia along the frontotemporal scalp extending into 2 symmetrical triangles along the parietal scalp reminiscent of the Greek letter upsilon (υ). Trichoscopy demonstrated loss of follicular ostia and peripilar casts. Histology demonstrated altered follicular architecture with decreased follicular density and focal perifollicular fibrosis with a lichenoid infiltrate. Both the trichoscopy and histology support a diagnosis of FFA.