Vitamin D deficiency among patients with lichen planopilaris or frontal fibrosing alopecia

Abstract

To the Editor: Lichen planopilaris (LPP), a prototypical, lymphocytic, cicatricial alopecia, is an inflammatory condition that affects the stem cell region of the hair follicle, known as the bulge. It may present as scalp alopecia; perifollicular scale and erythema; bald patches; and scalp pain, burning, or itching. Frontal fibrosing alopecia (FFA) is a variant of LPP, sharing some underlying pathology but differing in clinical presentation. LPP preferentially affects the vertex and crown scalp, whereas FFA primarily causes hair loss in the frontal hairline, eyebrows, and sideburns.