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Facial involvement of vitiligo is an important factor in patient's life and has often been evaluated separately from body surface area in clinical trials. However, no reliable measurement tools to measure facial vitiligo specifically are available thus far. To develop and validate a practical instrument for assessing facial vitiligo METHODS The ratios of a hand to a fingertip unit (FTU) of 98 healthy volunteers (age range 2-69 years) were calculated to define the FTU. Facial Vitiligo Area Scoring Index (F-VASI) was measured as the sum of