The correct answer is A. Yellow dots.

The correct answer is yellow dots. In frontal fibrosing alopecia, yellow dots represent dilated follicular ostia filled with keratin and sebum, indicating that the follicular structure is still present and at least partially viable. This suggests incomplete follicular destruction and therefore the greatest potential for stabilization and possible regrowth, making it the most favorable prognostic trichoscopic finding.

The other answer choices are incorrect. Loss of follicular ostia reflects permanent follicular destruction due to fibrosis. White dots similarly represent fibrotic replacement of hair follicles and indicate advanced disease. Perifollicular erythema is a marker of active inflammation but does not correlate with improved prognosis. Peripilar casts are a common diagnostic feature of FFA but are not of any prognostic value.

References: Alenezi S, Ezzat R, Miteva M
Frontal fibrosing alopecia part I – Diagnosis and clinical presentation
Journal of the American Academy of Dermatology, 2025; 94, 1059-1072