Response to Park et al. on the Clinical Use of Hair Diameter Diversity in Androgenetic Alopecia

The document discusses the validation of hair diameter diversity (HDD) as a quantitative marker for follicular miniaturization in androgenetic alopecia, as presented by Park et al. The study uses segmented linear mixed modeling to improve the evaluation of hair diameter variability, offering a more refined approach than fixed thresholds. The authors suggest that HDD could enhance the reproducibility of androgenetic alopecia grading and improve surgical planning by identifying miniaturization in donor zones. The study emphasizes the need for further validation across diverse populations and suggests that integrating HDD into automated trichoscopy could aid in monitoring treatment responses.