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Frontal fibrosing alopecia (FFA) was first described in 1994 and is considered a variant of lichen planopilaris in a patterned distribution that primarily affects postmenopausal women. Cicatricial alopecia of the frontoparietal hairline is characteristic; the affected area appears as a shiny, bandlike zone of incomplete hair loss with skin-coloured small hyperkeratotic papules. We describe a case of a premenopausal woman with this rare disease. To date there are very few reports of FFA in premenopausal women. The immunohistochemical investigation with lymphocytic markers (CD4, CD8, CD20, CD45RA, CD57) revealed CD8 positive lymphocytes penetrating the follicular epithelium. Direct immunofluorescence showed clumped deposition of IgM along the follicular basement membrane zone.