White Hair-Induced Increased Scalp Visibility: Clinical Implications for Hair Loss Evaluation and Hair Transplantation

The article discusses how white hair, due to its lack of melanin, can increase scalp visibility, often being mistaken for hair loss progression. This visual illusion occurs because the contrast between hair and scalp is reduced, making the scalp appear more exposed even when hair density and shaft diameter are unchanged. This phenomenon can complicate hair loss evaluations and hair transplantation planning. The article explores the optical reasons behind this effect, the non-linear relationship between white hair proportion and perceived scalp visibility, and potential diagnostic errors leading to unnecessary treatments. It also examines technical challenges in hair transplantation procedures like FUT and FUE. The authors propose five principles for dyeing strategies in patients with white hair, based on clinical experience, while noting the need for quantitative validation through future research.