Lichen Planopilaris

Lichen planopilaris (LPP) is a chronic, progressive, scarring alopecia that clinically presents as patchy or diffuse hair loss. The crown and frontotemporal scalp commonly are involved with associated symptoms of tenderness, pruritus, or burning. Physical examination typically reveals perifollicular erythema and scale with eventual loss of follicular ostia. Classic lichen planus on non–hair-bearing skin, nails, or mucous membranes can concomitantly be seen. Histologic examination of LPP classically reveals a folliculocentric lichenoid infiltrate preferentially targeting the infundibulum.